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The TF 500 cylinder feed is designed for use with the HLX 5 rock drills.
The design of the feed aims at simplicity of structure and ease of maintenance. The maincomponents and the operating principle of the cylinder feed are described later.
These instructions also include a description of the most common maintenance tasks.
The service department is always willing to give advice and help in anyservice--related problems. The trained service personnel of your dealer usethe proper tools and modern instruments, and the required original spareparts.
2. SAFETY
Before starting maintenance work, move the rig away from thesite where you have just been drilling.
Perform maintenance and repair work only when the rig isstopped. Remember to make sure that the rig cannot beaccidentally started during repair.
Follow all safety instructions, and always protect yourself withthe necessary safety devices. Use proper tools.
Keep all inflammable material, such as oily rags, etc., at a requireddistance from the working position.
Do not work under devices that are supported by hydraulics only.Use separate supports during maintenance and repairs.
Control the condition of hoses regularly, and check that they runproperly in the guides. Remember that a hose breakage can alsocause personal injury.
When checking the hydraulic circuit for leaks, look and listen, donot feel about with hands – high--pressure oil sprays canpenetrate the skin and cause serious injuries.
Watch out for rotating parts.
Certain work phases require the use of a feed cylinder duringrepair. Make sure that
-- it does not cause any danger
-- the rig can be stopped at once, if necessary, and that
-- the powerpack is stopped again before continuing the repair work.
The feed is constructed so that the cylinder tube (1) is a moving part, and the piston rod(2) is fixed to the rear end of the feed beam. The intermediate centraliser (3) and the hosereel (4) are fixed to the cylinder tube (1), and move along with the cylinder tube. The travelspeed of the rock drill (5) is doubled with a system of wire ropes (6 and 7)and returnwheels(8 and 9) fixed to the intermediate centraliser and the hose reel.
The beam of the TF 500 is made of an aluminum profile with the sliding surfaces facedwith stainless steel strips.
The carriers of the rock drill, hose reel, and intermediate centraliser move along the feedbeam on similar slide pieces. Each slide piece is fastened to the carrier with three screwsand nuts through the frame strip. The screws lock the slide piece lengthwise. The formof the slide pieces and their supports function as lateral locking.
Steel strip
Slide piece
Frame strip
Carriage
Locating shoulder
Adjusting holes
7.2. Adjusting slide pieces
The slide pieces normally require noadjustments when replaced, as the piecesare located to correct clearances at the
beam centre line with the aid of locatingshoulders on the carriers and the framestrips.
If the slide pieces are so worn that theclearance is more than 3 mm, theclearance can be adjusted to the specifiedvalue with the slotted holes in the carriages.
After adjustment, the screws are tightenedto 120 Nm.
The steel strips on the beam can become damaged, for instance, by rocks falling on thebeam. The steel strip (5) is available as a spare part in 7.5 m lengths.
1. Open the four front centraliser mounting screws (2). Remove the front centraliserbody (1) from the front end of the beam.
2. Remove all slide pieces (3) and their frames (6) from one side of the cylinder feedTF 500.
3. Remove the mounting pieces (4). Remove the old steel strip. Wash the rail.
4. Slide the new steel strip (5) on the feed and put it in place by turning the steel strip.
Use silicone for sealing.5. Push the steel strip (5) against the rear end, and cut the steel strip to length.
6. Use mounting pieces (4) to tighten the steel strip (5).
7. Replace the slide pieces (3).
8. Repeat steps 1 to 7 to the other side of the cylinder feed TF 500.
9. Mount the front centraliser body to the beam. Tighten the screws (2) to 300 Nm.
10. It is recommended that you remove the wear pieces of the rock drill, hose reel andcentraliser to make the change easier.
The maximum working pressure of the cylinder is 180 bar for forward feed and 250 barfor return movement. Oil is led into the cylinder through the piston rod, to both sides of thepiston.
2. Install the new seal into its groove by gently stretching it with the aid of e.g. ascrewdriver. Installing can be made easier by warming up the seal in an oven, oilbath or water (to max. 200˚C).
3. After installing, set the seal into its groove using e.g. a cylinder tube. Lubricate theseal first.
Replacing piston rod seal
1. Bend the piston rod seal with caution so that no sharp bends are formed. Installthe sealing ring into the correct groove using your fingers and press the seal intothe groove with your fingers.
2. Set the seals into the grooves after installing. An oiled piston rod can be used forthe setting the seals, but do it very carefully as the setting direction is unfavorableto the seals. The wiper is slipped into its groove.
1. Replace the cover O--ring. Check that the O--ring is nottwisted.
2. Push the piston and piston rod carefully into thecylinder tube.
3. Screw the cover to the end of the cylinder tubeand tighten it with tightening torque of 750 Nm.
4. Fasten the return wheel bracket to the end of the cylindertube wit the socket screws (3 pcs).
5. Screw the hose nipples to the piston rod. Use new seals.
6. Screw the mounting piece to the piston rod end and tightenit with tightening torque of 300 Nm. Lock it with the socketretainer screws (2 pcs). Secure it with Loctite 243.
Check the condition of the hose reel components at least in conjunction
with every second rock drill overhaul.
D Disconnect the rock drill hoses and plug them.
D Lift the hoses off the drum.
D Disconnect the return wire.
D Disconnect the hose drum base plate from the hose drumcarriage and lift the hose drum off.
D Open the four bolts (13).
D Remove the cover (12).
D Open the axle nut (9) and remove the securing plate (10).
D Lift the hose reel (1) off the axle.
D Remove the bushing (4).
D Lift the return wheel (5) and its bearings (7, 8) off.
D Check the condition of the ball bearings (6, 7 and 8).Replace if necessary.
10. HOSE SUPPORT
The hose support is mounted to the side of the feed beam. The rock drill hoses aremounted to it in the order shown in the figure. The feed cylinder hoses are also connectedto the hose support as shown.
A new wire tends to stretch at first until the wire strands have become somewhatstraightened. Therefore, retighten the wires after replacement when, for instance, oneround has been drilled.
Adjustment is done when the wire is unloaded and the hose reel is in the rear position.
1. Adjust the return wire (A) at the wire end connected to the hose support. The wireend is provided with a threaded piece and locking nuts.
D Open the locking nut (2) at the hose support and use the other nut (1) to tightenthe wire. Use a suitable tool to prevent the wire from turning.
D Tighten the locking nut (2).
2. Tighten the pulling wire (B) using the tubular nut (3) at the rear end of the feed.
D Open the locking nut (4) through the opening at the rear end of the beam.
D Use a suitable tool to prevent the wire from turning, and tighten the wire so that acorrect clearance (85 to 88 mm for stabiliser model or 150 to 153 mm for basicmodel) is left between the rear of the rock drill and the front edge of the hose reel,as shown in picture on page 18.
The front and intermediate centralizers are equipped with wear pieces (2) made of steel.The pieces are locked to the body (1) with jaw pieces (3). The jaw pieces are mountedto the body with screws (4), tightening torque 300 Nm.
The buffer (5), acting as a stinger, is mounted to the front centraliser body (1) with fourbolts (7) (4 pcs, tightening torque 100 Nm).
The front centraliser is mounted to the feed beam with four bolts (8), tightening torque 300Nm.
4
2
3 51
7 8
Front centraliser
(100 Nm)
(300 Nm)
(300 Nm)
4
2
3
1
Intermediate centraliser
The intermediate centraliser (1) is mountedto the base plate (2) with four bolts (3).The base plate is mounted to the returnwheel bracket (4) with four bolts (5).
The pulling wire return wheel (2) ismounted to the return wheel bracket (1) asshown in the figure.
When replacing the bearings (3), drive thepin (4) through the axle (5) so that the axlecan be removed.
NOTE! Before assembling new
bearings, remove inner seals.
To make the replacement of the bearings(3) easier, remove the return wheel bracket(1) from the cylinder tube end after openingthe three retaining screws.
16. PERIODIC MAINTENANCE
16.1. Each shift
1. Visually check the condition of the components and hoses. Report possible faultsimmediately.
2. Check the inside of the feed beam for loose rocks and excessive amounts of drillcuttings. Remove as necessary.
16.2. Every week
1. Wash the feed with a high--pressure washer as often as possible – at least once a week.
2. Check the sliding clearances of the carriages and the condition of the slide pieces. Adjust or replace as necessary.
3. Check the tightness and condition of the feed wires. Adjust as necessary.
4. Check the tightness of bolts and nuts. If a self--locking nut has loosened, replaceit. If an ordinary bolt connection loosens repeatedly, use a self--locking nut orchemical thread locking compound.
5. Check the tension of the hoses. Adjust as necessary.
The TFX 500 cylinder feed is designed for use with the HLX 5 rock drills.
The design of the feed aims at simplicity of structure and ease of maintenance. The maincomponents and the operating principle of the cylinder feed are described later.
These instructions also include a description of the most common maintenance tasks.
The service department is always willing to give advice and help in anyservice--related problems. The trained service personnel of your dealer usethe proper tools and modern instruments, and the required original spareparts.
Adjusting slide pieces using ‘adjusting screws’. The adjustment is carried out beforetightening of the screws. Adjust the slide piece frames so that the clearance between theslide piece and the steel strip is less than 1.5 mm.
Note! With the TFX 500 feed you must use approx. 15 bar (TFX 550, 50 bar) higher feedpressure than with TF feed, because of the pressure relief valve mounted into the line of upper feed cylinder B port.
Example: If you normally use 90 bar feed pressure with the TF feed, you have to set the
feed pressure up to 105 bar (TFX 550, 140 bar) with the telescopic feed by using the feedpressure adjusting valve.
The feed pressure can also be adjusted during drilling. The adjustment is correct, whenthe beam and rock drill move simultaneously (not with the same speed). The feedpressure is adjusted 0.5 times higher than the value of the adjusted valve compared tothe TF feed.
20.1. Adjusting the intermediate and maximum length
When you adjust the TFX 500 feed to intermediate or maximum length, you must adjustthe feed to minimum length first (steps 1 to 4). There is no middle position setting for themodel TFX 550.
1. Open the ball valves (1) and (2) fully.
2. Feed the rock drill forward until the whole system has the shortest position(minimum length).
3. Close the ball valve (2) fully.
4. Feed the rock drill backward until it is facing the rear stopper, and run it against therear stopper for approximately 10 seconds.
5. Open the ball valve (2).
6. Run the feed’s inner tube to desired length by running the rock drill against the rearstopper.
(With lower cylinder )
7. Close the ball valve (2).
8. Feed the rock drill against the rear stopper for about 10 seconds.
9. Close the ball valve (1) fully.
10. Open the ball valve (2) fully.
11. Check that the ball valve (1 ) is fully closed and the ball valve (2) is fully open. (Alsosee the shield on the next page)
The maximum working pressure of the cylinder is 180 bar for forward feed and 180 barfor return movement. Oil is led into the cylinder through the piston rod, to both sides of thepiston.