Transcript
Shutdown SIS
Previous Screen
Product: NO EQUIPMENT SELECTED
Model: NO EQUIPMENT SELECTED
Configuration: NO EQUIPMENT SELECTED
Reuse And Salvage Guidelines Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438, 446, 446B Backhoe
Loaders; 12G, 14G, 14H, 16G, 16H, 120G, 130G, 140G, 140H, 160G, 160H Motor
Graders; and D4H, D5H, D6H, D8L Track-type Tractors Media Number -SEBF8133-02 Publication Date -19/01/2001 Date Updated -11/12/2001
Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438, 446, 446B Backhoe Loaders; 12G, 14G, 14H, 16G, 16H, 120G, 130G, 140G, 140H, 160G, 160H Motor Graders; and D4H, D5H, D6H, D8L Track-type Tractors
SMCS - 3203; 5070; 5084
SEBF8133-02 January 2001
SMCS Code(s): 3203, 5070, 5084
GUIDELINE FOR
REUSABLE PARTS
AND SALVAGE
OPERATIONS
Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438, 446, 446B Backhoe Loaders; 12G, 14G, 14H, 16G,
Page 1 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438,...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
16H, 120G, 130G, 140G, 140H, 160G, 160H Motor Graders; and D4H, D5H, D6H, D8L Track-type Tractors
Summary of Revisions
Page Description
All Revised Format.
IntroductionThis Guideline enables dealers and their customers to benefit from cost reductions made possible through an established parts reusability and salvage program. Every effort has been made to provide the most current and relevant information known to Caterpillar Inc. Since the Company makes ongoing changes and improvements to its products, this Guideline must be used with the latest technical information available from Caterpillar to ensure such changes and improvements are incorporated where applicable.
For questions or additional information concerning this Guideline, contact Caterpillar Service Support Division, Dealer Support (309) 675-5156.
SummaryThe purpose of this Guideline is to give visual guidelines to see if piston pump and motor parts can be used again. When used in the same application, parts that can be used again can be expected to give normal performance until the next overhaul.
Never install a part that this Guideline shows cannot be used again. During reconditioning, correct any conditions that might have caused the original failure.
References
Reference Material
Form Title
SEBF2000 Metal Spray Guide
Page 2 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438,...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Equipment and Tooling
Equipment and Tooling
Part No. Description
- Optical Flat
- Inside Micrometer
- Outside Micrometer 0 to 25 mm (0 1.0 in)
- Outside Micrometer 25 to 50 mm (1.0 to 2.0 in)
- V-Block
7B0337 Surface Plate
4C5043 Power Lapping Machine (optional)
4C5852 Pins
4C5853 Pins
4C5854 Pins
4C5855 Pins
4C5856 Pins
8T5096 Dial Indicator Group
6V7898 Dial Bore Gage Assembly
Page 3 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438,...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
6V7899 Size Setting Fixture Group
Cleaning Procedure
Pressure air can cause personal injury. When using pressure air for cleaning, wear a protective face shield, protective clothing, and protective shoes. The maximum air pressure must be below 200 kPa (30 psi) for cleaning purposes. Use all cleaning solutions and solvents with care.
Before a part is inspected, wash it in a clean solvent which is made from petroleum. Wash each part separately. If several parts are washed together, there is a possibility that a machined surface can be damaged. Use compressed air to dry the part. Put hydraulic oil on the part to prevent rust or corrosion. Put the part in a clean container. Use a lint-free towel to clean the part before assembly. Be sure to put oil on all of the parts during assembly.
Inspection ProcedurePiston pump and motor parts normally have wear patterns that can be seen but can not be felt with a fingernail or lead pencil after the salvage procedure. This type of wear has no effect on the performance of the part. Unless stated in this Guideline, parts that have wear patterns that can be felt with a fingernail or lead pencil after the salvage procedure can not be used again. Throughout this Guideline, the fingernail or lead pencil inspection will be used to see if a part can be used again.
Touch Lapping ProcedureIn this Guideline, the touch lapping procedure is used on some parts so they can be used again. The touch lapping procedure will not give a part a "like new" surface or surface flatness. It is used only to remove discoloration and very small surface marks.
Use 4/0 emery polishing paper manufactured by the Minnesota Mining and Manufacturing Co., or by Norton Co., or an equivalent emery polishing paper. Put the emery paper on a ground surface plate (7B0337 Plate) so the paper is smooth. Do not use any other surfaces. Make the emery paper wet with a clean solvent made from petroleum. Put the part on the emery paper with the surface to be "touch lapped" on the
Page 4 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438,...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
paper. Move the part in a pattern like a number "8". Normally it is not necessary to make more than 10 complete number "8" patterns.
Wash the part in a clean solvent. Let the part dry at room temperature. Put hydraulic oil on the part and then put the part in a clean container.
NOTICE
When you handle or put pump and motor parts in storage, care must be taken to prevent damage to the machined surfaces.
Illustration 1
Touch lapping procedure used on a piston slipper face.
Power Lapping ProcedurePower lapping can remove wear patterns and surface scratches. This will provide a "near new" surface flatness on parts. The power lapping machine in Illustration 2 can be used on a wide range of parts that require very flat, very smooth surfaces. Power lapping can produce lap flat surfaces within tolerances of one light band (0.00295 mm or .000116 in). Consistent surface finishes of 2 to 3 RMS (root-mean-square) with absolute uniformity are easily attained.
Lapping machines are generally easy to operate. However, some very general guidelines must be followed. Check the lapping plates periodically, preferably every morning before starting production, to ensure lap plate flatness.
Fill the slurry tank with a lapping vehicle. The vehicle is usually purchased premixed and a lapping compound should be added to the vehicle at a rate of eight ounces per gallon. Run the machine without parts for a period of four to six minutes. This allows the compound to mix evenly in the vehicle.
Page 5 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438,...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Load the parts to be lapped inside the conditioning rings. The parts should be free to move about within the ring, and not packed such that they remain stationary. Lapping times will vary according to the severity of the flaw that is to be removed. Minor scratches or warpage can usually be removed within 30 to 60 minutes. In order to inspect the flatness of the lapped part, remove the dull finish that is caused by the lapping compound. Wash the part thoroughly. Polish the lapped surface, using 600 grit emery paper on a 4/0 polishing stand, until it will reflect light.
Illustration 2
A 914 mm (36 in) Caterpillar 4C5043 Power Lapping Machine.
Testing For FlatnessA monochromatic light source and an optical flat are required to determine flatness (see Illustrations 3 and 4).
Test for flatness by observing the light, emitted from the monochromatic light head, reflecting from the surface being checked, up through the optical flat. A series of dark bands and light spaces will be projected. The dark bands are not light rays, but show where interference is produced by reflections from the test piece in the optical flat. Inspect the light bands for straightness. If the bands are straight and parallel, the surface is absolutely flat. If the bands are curved, the surface is not absolutely flat but may be flat enough for your particular needs.
Page 6 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438,...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 3
Optical flat.
Illustration 4
Light band pattern.
Variable Pump Rotating Group
Page 7 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438,...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 5
Nomenclature.
(1) Barrel Assembly,
(2) Piston Assembly,
(3) Retraction Plate,
(4) Wear Plate,
(5) Spacer.
Piston Assembly
Piston Slipper
Check to see if the slipper will move by hand on the piston ball. The slipper can feel loose or tight but must move in all directions without binding. If binding is felt, do not use the piston assembly again.
Note:
Be sure the lubrication port is not plugged. Use a wire to check the hole.
Page 8 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438,...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 6
Piston slipper with shallow grooves on the side of slipper.
Use again
Piston Slipper Face
Illustration 7
Slipper face nomenclature.
(6) Bearing Area,
(7) Lubrication Port,
(8) Piston,
(9) Balance Land.
Page 9 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 438,...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 8
Slipper face nomenclature.
(6) Bearing Area,
(7) Lubrication Port,
(8) Piston,
(9) Balance Land.
Note:
Polishing marks on the new faces are normal. These marks can not be felt with a fingernail or lead pencil.
Illustration 9
Piston slipper with embedded metal in bearing area.
Use again -
after hand lapping if reuse criteria are met.
Page 10 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 10
Piston slipper with light scratches that can be felt with a fingernail or lead pencil.
Use again -
after hand lapping if reuse criteria are met.
Illustration 11
Piston slipper with damage to bearing surfaces.
Use again -
only if reuse criteria are met.
Page 11 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 12
Piston slipper with large "pop outs" and metal embedded in bearing area.
Do not use again
Illustration 13
Piston slipper severely damaged due to cavitation and contamination.
Do not use again
Piston Assembly
Page 12 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 14
Piston assembly that has gray bands.
Use again
Illustration 15
Piston assembly with scratches that can be felt with a fingernail or lead pencil.
Do not use again
Page 13 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 16
Piston assembly with metal flakes or scratches that can be felt with a fingernail or lead pencil.
Do not use again
Illustration 17
Piston assembly that has blue discoloration.
Do not use again
Page 14 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 18
Piston on left has light surface scratches that can not be felt with a fingernail or lead pencil.
Use again
Piston on right has light surface scratches that can be felt with a fingernail or lead pencil.
Do not use again
Illustration 19
Page 15 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Piston that has lost the slipper.
Do not use again
Illustration 20
Piston exposed to severe contamination.
Do not use again
Illustration 21
Piston exposed to severe contamination that has seized in piston bore.
Page 16 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Do not use again
Specifications
Piston Slipper Thickness
Illustration 22
Corners of piston slippers must be square.
The piston slipper must swivel smoothly.
Illustration 23
Slipper must swivel smoothly.
Page 17 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Measure the thickness of the slipper face with a 0 to 25 mm (0 to 1.0 in) micrometer. If the dimension measured is less than the piston slipper thickness given in Chart A, the piston assembly can not be used again.
Illustration 24
Measurement of the slipper face thickness.
Illustration 25
Measurement of slipper thickness. See Chart A.
Chart A. Piston Slipper Thickness
Reference Piston Diameter
Minimum Slipper Thickness
Page 18 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
17.04 mm (.671 in) 3.30 mm (.130 in)
19.23 mm (.757 in) 5.29 mm (.208 in)
20.90 mm (.823 in) 5.57 mm (.219 in)
23.04 mm (.907 in) 5.05 mm (.199 in)
26.11 mm (1.028 in) 5.97 mm (.235 in)
The slipper faces of all the pistons from a single pump or motor must be measured. There must not be a difference of more than 0.02 mm (.001 in) between the thickest and thinnest dimension in a set of pistons.
If a new piston assembly is used in a set with used piston assemblies and the new piston slipper is more than 0.02 mm (.001 in) thicker than the other pistons in the set, the touch lapping procedure can be used to make the new slipper thinner.
Illustration 26
Piston slipper thickness between thickest and thinnest dimension.
Piston Assembly End Play
Check the end play of the piston assembly with a V-block, two other pistons, a dial indicator and a flat plate. Put the piston to be measured in the Vee of the V-block with the V-block on the slipper back faces. Put the dial indicator into position with the pointer on
Page 19 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
the end of the piston. Push down on the piston and set the dial indicator at zero. Pull up on the piston. End play movement cannot exceed 0.13 mm (.005 in).
Illustration 27
Measurement of the piston assembly end play.
Illustration 28
Slipper end play limits.
(H) Pull up.
(J) Push down.
(K) Endplay of 0.13 mm (.005 in).
Barrel Assembly
Page 20 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 29
Nomenclature,
(10) Seal Bands,
(11) Port,
(12) Splines,
(13) Thrust Surface.
Illustration 30
Barrel assembly with wear step in the seal band.
Use again -
if wear step can be removed by power lapping procedure.
Page 21 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 31
Scoring on the surface due to contamination.
Use again -
after power lapping.
Illustration 32
Barrel assembly with polished surface and no wear step in the seal band and thrust surface.
Page 22 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Use again
Illustration 33
Barrel assembly with discoloration. Scratches in the block surface can not be felt with a fingernail or lead pencil.
Use again
Illustration 34
Barrel assembly with smeared thrust surface.
Use again -
after use of touch or power lapping procedure.
Barrel Assembly Bores
Use the following procedure to check the barrel assembly bores.
Page 23 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Wash the barrel assembly and piston in a clean solvent. Use compressed air to dry off the barrel assembly and piston.
1.
Illustration 35
How to check the side movement of a piston in a barrel assembly bore.
1.Put a piston into one of the bores to the maximum depth that the piston will go into the bore during operation.
2.
Feel for side movement of the piston in the bore. Do this for all of the bores.3.
If no movement or only very little side movement can be felt in all of the bores, the barrel assembly can be used again.
NOTE:
Use a piston in a new barrel assembly to see how much side movement can be permitted.
If necessary, use a dial bore gauge to measure the bore diameters. If any of the bore measurements are more than the maximum measurement given in Chart B, the barrel assembly can not be used again.
Chart B. Barrel Bores
Reference Piston Diameter
Maximum Barrel Bore
17.04 mm (.671 in) 17.07 mm (.672 in)
19.23 mm (.757 in) 19.29 mm (.759 in)
Page 24 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
20.90 mm (.823 in) 20.96 mm (.825 in)
23.04 mm (.907 in) 23.09 mm (.909 in)
26.11 mm (1.028 in) 26.17 mm (1.030 in)
Illustration 36
Measurement of barrel bores; and measurement of barrel length and barrel face. See Charts B and C.
The barrel length must not be less than the dimension given in Chart C.
Chart C. Barrel Length
Reference Piston Diameter Minimum Barrel Length
17.04 mm (.671 in) 72.62 mm (2.859 in)
19.23 mm (.757 in) 92.25 mm (3.632 in)
20.90 mm (.823 in) 98.65 mm (3.884 in)
23.04 mm (.907 in) 113.75 mm (4.478 in)
26.11 mm (1.028 in) 119.64 mm (4.710 in)
The barrel face, identified in Illustration 36, must be perpendicular to the splines within 0.05 mm (.0015 in).
Page 25 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
The barrel face can not exceed a surface finish of 0.20 µ m (8 µ in).
The barrel face must be flat within 0.0013 mm (.00005 in).
Barrel Assembly Splines
If no wear can be seen on the barrel assembly splines, the barrel assembly can be used again. If necessary, use two pins and an inside micrometer to measure the splines. Put the pins 180° apart in the worn area of the splines. For barrel assemblies that have an odd number of spline teeth, put the pins in splines as near to 180° apart as possible. Use clay or masking tape to hold the pins in position.
The diameter between the measuring pins must not be greater than the dimension given in Chart D. Use two 4C5856 Pins, 2.74 mm (.108 in), for the spline measurement. These pins are not an actual pump part but a tooling device and can be ordered through Caterpillar Parts system.
Chart D. Barrel Splines
Reference Piston Diameter
Max. Dimension Between Pins1
17.04 mm (.671 in) 24.71 mm (.973 in)
19.23 mm (.757 in) 32.59 mm (1.283 in)
20.90 mm (.823 in) 35.79 mm (1.409 in)
23.04 mm (.907 in) 38.96 mm (1.534 in)
26.11 mm (1.028 in) 45.34 mm (1.785 in)
1
Use two 4C5856 Pins, 2.74 mm (.108 in), for the spline measurement.
Page 26 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 37
Measurement of barrel splines between pins.
Retraction PlateCheck the retraction plate to make sure it is flat. Put the plate on a surface plate (7B0337 Plate). With fingers and thumb, push down on opposite edges and see if any rocking motion can be felt. If rocking motion can be felt, the plate is not flat and can not be used again unless made flat by grinding.
Illustration 38
Test to see if the retraction plate is flat.
Page 27 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 39
Retraction plate with wear at slipper contact area.
Use again -
after touch lapping and only if plate is flat.
Illustration 40
Retraction plate.
Use again -
after touch lapping if plate is flat.
Page 28 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 41
This plate shows damage from slipper "lifting". Also, polished or scored surfaces on the area where the spherical washer rides is not acceptable.
Do not use again
Wear Plate
Illustration 42
Wear plate with a scratch across the slipper seat area that can be felt with a fingernail or lead pencil. Wear plates should not be used again without first power lapping to remove scratches.
Page 29 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Use again
Illustration 43
Wear plate that is polished in the slipper seat area.
Use again
Page 30 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 44
Wear plate with scratches that can not be felt with a fingernail or lead pencil.
Use again
Page 31 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 45
Wear plate with discoloration on the back side.
Use again
Illustration 46
Wear plate with circumferential marks on the back side.
Use again
Page 32 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 47
Wear plate with groove and wear step in the slipper seal area.
Do not use again
Illustration 48
Wear plate with heat cracks that can be felt with a fingernail or lead pencil.
Do not use again
Illustration 49
Page 33 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Wear plate with smeared surface and corrosion pitting.
Do not use again
Illustration 50
Damage caused by piston that has lost a slipper.
Do not use again
Port Plate
Illustration 51
Nomenclature.
(14) Rib, (10) Seal Band, (15) Thrust Face, (11) Port.
Page 34 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Note:
Use the power lapping procedure on both sides of all port plates that can be used again before they are installed.
The port plate thickness must not be less than the dimension given in Chart E.
Chart E. Port Plate Thickness
Reference Port Plate Diameter Minimum Thickness
97.92 mm (3.855 in) 5.00 mm (.197 in)
101.35 mm (3.990 in) 6.02 mm (.237 in)
112.50 mm (4.429 in) 6.40 mm (.252 in)
121.62 mm (4.788 in) 8.43 mm (.332 in)
138.66 mm (5.459 in) 8.61 mm (.339 in)
Illustration 52
Measurement of the port plate.
The port plate face, as shown in Illustration 52, must have a surface finish of 0.20 µ m (8 µ in).
Page 35 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
The port plate face must be flat within 0.0013 mm (.00005 in).
Illustration 53
Port plate that has erosion in the seal band.
Use again -
after power lapping procedure.
Illustration 54
Port plate with erosion not more than half way into the seal band.
Use again -
after power lapping procedure.
Page 36 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 55
Port plate after the power lapping procedure.
Use again
Illustration 56
Port plate with scratches in the seal band and thrust surface that can not be felt with a fingernail or lead pencil.
Use again
Page 37 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 57
Port plate with scratches across the seal band that can be felt with a fingernail or lead pencil.
Use again -
after power lapping if reuse criteria are met.
Illustration 58
Port plate with discoloration.
Use again -
only after power lapping to remove discoloration.
Page 38 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 59
Port plate with discoloration on the back side.
Use again -
only after power lapping to remove discoloration.
Head Assembly
Illustration 60
Aeration damage.
Use again -
after power lapping (See Note).
Note:
Page 39 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
The surface shown in Illustrations 60, 61, and 62 can be power lapped a maximum of 0.38 mm (.015 in). Metering notches must be altered accordingly. Bearing must be removed and replaced.
Illustration 61
Erosion on face.
Use again -
after power lapping (See Note).
Illustration 62
Fine scratches and corrosion.
Use again -
after power lapping (See Note).
Page 40 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 63
Extreme damage caused by foreign object passing through pump.
Do not use again
Swashplate
Illustration 64
Swashplate with discoloration and polishing on the wear plate surface.
Use again
Page 41 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 65
Swashplate with buttons that are polished but with no deep grooves or scoring.
Use again
Illustration 66
Swashplate bolts are subject to continuous loading/unloading frequencies. Incorrect tightening of the bolt can cause splitting breakage as shown.
Do not use again
Shafts
Page 42 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 67
Nomenclature.
(16) Seal surface,
(17) Output splines,
(18) Crown splines.
Illustration 68
Shaft with wear in the seal surfaces that can be seen but can not be felt with a fingernail or lead pencil.
Use again
Page 43 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 69
Shaft with normal wear in splines.
Use again
Illustration 70
Shaft with wear on the splines. No wear steps can be seen.
Use again
Page 44 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Illustration 71
Shaft with wear on the splines. Wear steps can be seen.
Do not use again
Illustration 72
Shaft with excessive wear in splines.
Do not use again
Spline Measurement
If the splines have a visible wear step, the shaft can not be used again. If necessary, measure the splines. Use two pins in splines 180° apart. For those shafts that have an odd number of spline teeth, put the pins in splines as near to
Page 45 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
180° apart as possible. Put rubber bands around the pins and shaft to keep the pins in place. Use an outside diameter micrometer to measure across the pins.
Illustration 73
Measurement of both pump shaft splines over pins. See Charts F and G.
Illustration 74
Measurement of the shaft crown splines over pins.
The crown splines of the pump shaft must not be less than the dimension given in Chart F. Use two 4C5855 Pins, 3.05 mm (.120 in), for the spline measurement. These pins are not an actual pump part but a tooling device and can be ordered through Caterpillar Parts system. Crown spline measurements must be taken from the center of the splines to assure accuracy (See Illustration 73).
Feel for a wear step with a lead pencil or finger nail. If a wear step is evident, be sure to position pins in the worn area.
Chart F. Crown Splines of Pump Shaft
Page 46 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Reference Piston Diameter Minimum Spline Dimension Over Pins
17.04 mm (.671 in) 33.07 mm (1.302 in)
19.23 mm (.757 in) 40.97 mm (1.613 in)
20.90 mm (.823 in) 44.15 mm (1.738 in)
23.04 mm (.907 in) 47.35 mm (1.864 in)
26.11 mm (1.028 in) 53.70 mm (2.114 in)
The output splines of the pump shaft must not be less than the dimension given in Chart G.
Chart G. Output Splines of Pump Shaft
Shaft Part No.
Pin Diameter
Pin Part No.
Minimum Spline Dim. Over Pins
9T2016 3.05 mm (.120 in)
4C5855 28.24 mm (1.112 in)
9T3039 3.05 mm (.120 in)
4C5855 28.24 mm (1.112 in)
9T3932 2.03 mm (.080 in)
4C5852 23.06 mm (.908 in)
9T6755 4.57 mm (.180 in)
4C5853 35.69 mm (1.405 in)
9T9461 4.06 mm (.160 in)
4C5854 35.69 mm (1.405 in)
9T3933 3.05 mm (.120 in)
4C5855 28.24 mm (1.112 in)
Page 47 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
9T1634 3.05 mm (.120 in)
4C5855 31.34 mm (1.234 in)
9T7783 4.06 mm (.160 in)
4C5854 35.69 mm (1.405 in)
9T8629 3.05 mm (.120 in)
4C5855 18.44 mm (.726 in)
9T9457 3.05 mm (.120 in)
4C5855 18.44 mm (.726 in)
9T8648 4.06 mm (.160 in)
4C5854 35.69 mm (1.405 in)
Shaft Seal Area
Illustration 75
Grooves in the seal area can be felt with a fingernail.
Use again -
after the seal area is salvaged according to the correct procedure (see Procedure to Salvage Shaft Seal Area).
Page 48 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Procedure to Salvage Shaft Seal Area
Grooves in the seal area that can be felt with a fingernail (as shown in Illustration 74) can be removed to make the part usable again.
Note:
Follow the metal spray manufacturer's directions carefully in the application of metal spray to the shaft seal area.
Basically, the salvage procedure is as follows:
Measure the shaft outside diameter at the seal area and the shoulder radius (if present) and make a note of each dimension.
1.
Restore the surface to the original size by using metal spray or an equivalent procedure. Metal spray is a recommended method. Each step in the procedure is critical in achieving the desired coating bond and surface finish.
2.
See Caterpillar's Metal Spray Guide, SEBF2000, about Metal Spray repair procedures. For complete information, contact the Metal Spray engineer, Caterpillar Inc. Service Development, Service Support (309) 675-5434.
3.Grind the restored seal area to the diameter measured in Step 1, ñ0.05 mm (ñ.002 in). The surface finish must be 0.40 to 0.80 µ m (16 to 32 µ in). The wheel radius must be the same or greater than the shoulder radius measured in Step 1.
4.
Other Components In The Rotating Group
Illustration 76
Inspection of pins and spherical washer in the rotating group.
(19) Pins,
(20) Spherical Washer,
(21) Plate,
(22) Retainer,
(1) Barrel Assembly.
Page 49 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
Pins (19) shown in Illustration 76 must be straight and of equal length on the 9T6857, 9T0290, 4T1029 and 4T6895 Hydraulic Pumps. Replace all pins if one is defective.
For those pumps with a 17.04 mm (.671 in) reference piston diameter, inspect spherical washer (20) shown in Illustration 76 for burrs, wear and damage due to pin breakage.
Summary ChartsThe following charts summarize all of the specifications listed in this Guideline and provide a single specification sheet for new dimensions for piston pump components.
Hydraulic Piston Pump Specifications Summary Chart
(A) (B) (C) (D) (E) (E)
Reference Piston Diameter
Minimum Slipper
Thickness
Maximum Barrel Bore
Minimum Barrel Length
Barrel Splines Max. Dimension Between
Pins1
Port Plate Reference Diameter
Port Plate MinimumThickness
17.04 (.671) 3.30 (.130) 17.07 (.672) 72.62 (2.859) 24.71 (.973) 97.92 (3.855) 5.00 (.197)
19.23 (.757) 5.29 (.208) 19.29 (.759) 92.25 (3.632) 32.59 (1.283) 101.35 (3.990) 6.02 (.237)
20.90 (.823) 5.57 (.219) 20.96 (.825) 98.65 (3.884) 35.79 (1.409) 112.50 (4.429) 6.40 (.252)
23.04 (.907) 5.05 (.199) 23.09 (.909) 113.75 (4.478) 38.96 (1.534) 121.62 (4.788) 8.43 (.332)
26.11 (1.028) 5.97 (.235) 26.17 (1.030) 119.64 (4.710) 45.34 (1.785) 138.66 (5.459) 8.61 (.339)
Note: All dimensions are mm (in). 1 Use two 4C5856 Pins, 2.74 mm (.108 in), to find the minimum dimension between pins for spline measurement.
Summary Chart: Measurement of Shaft Splines For Reusability
Shaft Crown Splines (F) Shaft Pump Splines (G)
Reference Piston
Diameter
Minimum Dimension Over Pins2
Shaft Part No.
Pin Diameter
Pin Part No. Minimum
Dimension Over Pins
Page 50 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
17.04 (.671)
33.0 (1.302) 9T2016 3.05
(.120) 4C5855 28.24 (1.112)
17.04 (.671)
33.12 (1.304) 9T3933 3.05
(.120) 4C5855 28.24 (1.112)
17.04 (.671)
33.12 (1.304) 9T3932 2.03
(.080) 4C5852 23.06 (.908)
19.23 (.757)
40.97 (1.613) 9T3039 3.05
(.120) 4C5855 28.24 (1.112)
19.23 (.757)
40.97 (1.613) 9T6755 4.57
(.180) 4C5853 35.69 (1.405)
20.90 (.823)
44.15 (1.738) 9 634 3.05
(.120) 4C5855 31.34 (1.234)
20.90 (.823)
44.15 (1.738) 9T9457 3.05
(.120) 4C5855 18.44 (.726)
23.04 (.907)
47.35 (1.864) 9T9461 4.06
(.160) 4C5854 35.69 (1.405)
23.04 (.907)
47.35 (1.864) 9T7783 4.06
(.160) 4C5854 35.69 (1.405)
23.04 (.907)
47.35 (1.864) 9T8648 4.06
(.160) 4C5854 35.69 (1.405)
26.11 (1.028)
53.70 (2.114) 9T8629 3.05
(.120) 4C5855 18.44 (.726)
Note: All dimensions are mm (in). 2 Use two 4C5855 Pins, 3.05 mm (.120 in), to find the minimum dimension over pins for spline measurement.
Copyright 1993 - 2012 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sun May 20 17:31:39 EST 2012
Page 51 of 51Media Search - SEBF8133 - Hydraulic Piston Pumps Used in 416, 426, 428, 436, 4...
20/05/2012https://sis.cat.com/sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/sisweb/s...
top related