AC-S-840,840B A A l l l l i i s s C C h h a a l l m m e e r r s s Service Manual 840 & 840B Articulated Wheel Loader THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF ALLIS CHALMERS OR IT’S SUCCESSORS. ALLIS CHALMERS AND IT’S SUCCESSORS ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL. TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS.. Service Manual
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Allis Chalmers 840 | 840B Wheel Loader Service Manual · AC-S-840,840B AAlllliiss CChhaallmmeerrss Service Manual 840 & 840B Articulated Wheel Loader THIS IS A MANUAL PRODUCED BYJENSALES
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AC-S-840,840B
AAll ll iiss CChhaallmmeerrssService Manual
840 & 840BArticulated
Wheel Loader
THIS IS A MANUAL PRODUCED BY JENSALES INC. WITHOUT THE AUTHORIZATION OF ALLIS CHALMERS OR IT’S SUCCESSORS. ALLIS CHALMERS AND IT’S SUCCESSORS
ARE NOT RESPONSIBLE FOR THE QUALITY OR ACCURACY OF THIS MANUAL.
TRADE MARKS AND TRADE NAMES CONTAINED AND USED HEREIN ARE THOSE OF OTHERS, AND ARE USED HERE IN A DESCRIPTIVE SENSE TO REFER TO THE PRODUCTS OF OTHERS..
1. Pulley Hub 6. Seal Assembly 2. Shaft 7. Impeller 3. Bearing 8. Ceramic Seal 4. Water Pump Body 9. Body Plate 5. Slinger 10. a-Ring
11 . Snap Ring
NOTE: Slinger and Snap Ring not used in 200 Tractor.
GENERAL INFORMAT ION
A centrifugal type water pump is provided for circulating coolant through the engine and rad iator. The water pump is mounted on the front of the cylinder block and is belt driven from the crankshaft pulley. Coolant is drawn through the inlet opening by the pump impeller and forced through the outlet opening located in the outlet of the volute into and through the oil cooler and then into the cylinder block. Also, a portion of the coolant is forced through the volute into the cylinder block. O·ring gaskets are used to assure leak proof connections.
The water pump shaft and bearing assembly does not require lubrication because the bearing is of the sealed-forlife type.
The shaft and bearing assembly is secured in the pump body by a press fit_ The seal between the impeller and pump body is of the pack less type. The seal assembly is spring loaded and is pre5sed into the pump body forming a leak-proof seat at this point_
The carbon sealing surface is bonded to the seal assembly and contacts a ceramic seal insert bonded to the pump impeller. Proper pOSitioning of the impeller on the shaft creates a 9 to 13 pound load on the seal assembling forming a tight seal. The ceramic seal insert bonded to the im-
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WATER PUMP INSTALLED 1. Volute 2. Water Pump 3. Front of Cylinder Block
WATER PUMP VOLUTE INSTALLED
1. Volute 2. Cylinder Block 3. Timing Gear Cover
peller cannot be serviced separately. If it is damaged, a new impeller must be installed in the pump_ A pulley hub, pressed on the front end of the water pump shaft and bearing assembly, is the mounting member for the pulley and fan .
limit of .015 inch with a new thrust plate. the camshaft gear must be replaced. Remove the gear retaining capscrew and washer.
7. Place the camshaft in a press and force the camshaft from the gear.
CAMSHAFT, CAMSHAFT GEAR AND THRUST PLATE INSPECTION
1. If the engine has been operated with c lean oil and the correct quantity in the oil pan, the camshaft bearing joumals seldom wear to the extent that is necessary to replace the camshaft. The specified 0 .0 . of all camshaft bearing journal diameters is 2.130 inches to 2.131 inches. The specific inside diameter o f t he camshaft standard bearings installed is 2.133 inches to 2. 136 inches. The specified running clearance between the camshaft joumals and bearings is .002 inch to -lX)6 inch and must not exceed .008 inch. If the installation of new standard bearing will not reduce the running clearance below .008 inch, it is recommended to grind the camshaft journals to accommodate ,ala inch undersize bearings. Likewise, if the journals are worn or scored to t he extent that they will not accommodate .0 10 inch undersize bearings, the camshaft must be replaced.
2. Inspect the camshaft lobes for roughness. scoring or excessive wear, Replace the camshaft if any of these conditions are found. These conditions can be caused by inferior quality of lubricating oil, excessive valve lash adjustment, contaminated oil or the valve lifters not rotating.
3, Replace camshaft gear if teeth are nicked, scored or broken.
Before reusing a gear t hat has been removed from a camshaft, carefully check iU bore to be sure it is within t he specified size o f 1.373 inches t o 1.374 inches when measured at t he center and near both ends. The specified press fit of gear t o shaft is .0025 inch to .004 inch.
4. Inspect thrust p late for wear. Replace if the wear area is rough or the wear is excessive. New thrust plate thickness is.204 inch to.206 inch.
CAMSHAFT GEAR AND CAM SHAFT INSTALLATI ON<-
1. To install the camshaft gear on the camshaft proceed as follows:
a. Place camshaft in a press with the shoulder of the first journal nlsting 00 parallel bars. NOTE: The thrust plate must be positioned on the camshaft before pressing on the gear.
b. Heat the gear in oil to a temperatue of approximately 350 degrees to 400 degrees F.
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INSTALLING WOODEN OOWEL RODS IN THE VALVE LIFTERS
I . Cylinder Head Z. Wooden Dowel Rod J, Rubber Band
c. Using asbestos gloves, position the gear 00 the camshaft and align the gear keyway with the key in the camshaft.
d: Press the gear onto the shaft until the gear hub is flush with the front end of the camshaft. or until the specified end clearance of .001 inch · .011 inch is obtained between the thrust plate and the gear hub.
2. Check camshaft journal to bearing running clearance.
3. Oil the camshaft bearings and carefully insert the camshaft in the cylinder block. Be careful not to scratch or mar the bearings.
Bdore 'tarting the disassembly of the planetary rigid type nlc. the following procedures and precautions .hould betaken:
A. Jack up both ends of ule 10 that tires deu the ground due to the elll~rne weight of the vchicle under which planetary type ulet are used. The axle should then be blockcd up under each mountin~
AXlE
B.
0-1 0-1 D-3 0-4
. 0~5
0-6 0-6
D 0-8 D-8
O-ll 0-12 0-14 0-13 0-15
piate to safel~· support the weight and hold nle at
this le'"cl. The jacks may then be removed 10 pro. vide adequate working . pace with no danger of axle falling or .hilling. Remove th e wheel nut.
Remove the tire and wheel •.
C. Rotatc hub assembly 50 that the drain pluJ;" is at the bottom.