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SERVICE PROCEDURE
ADJUST IDLER CLEARANCE
Since the idlers are forced to move forward and backward by an external force guide plates will be worn out. Wear
of these plates will cause the vibration of idlers from side to side or inclination of the idlers, and running off of track
links from the idlers or unevenly worn idler and links may result.
Therefore, adjust the idlers according to the following procedure.
ADJUSTMENT
1.
Move the machine by 1 to 2m (3ft 3in to 6ft 7in) on a level
place, then measure clearance A between the track
frame and guide plate (at four places of both sides,
inside, and outside).
2.
If the clearance A exceeds 4.0mm (0.16in), loosen bolt
(1), and pull out the shim to adjust the clearance at one
end to 0.5 to 1.0mm (0.02 to 0.04in).
Thickness of one shim is 1.0mm (0.04in).
PROCEDURE FOR BLEEDING AIR OF HYDRAULIC SYSTEM
See "STARTING ENGINE (PAGE 3-60)".
Since the engine must be started and the blade must be operated, see OPERATION.
NOTICE
If the engine is run immediately at high speed or the cylinder is operated to the end of its stroke, the air
inside the cylinder may cause damage to the piston packing.
1.
Bleed air from head end of right pitch cylinder (Powertilt, Power pitch dozer only)
Bleeding air from the hydraulic system is required when removing and installing the work equipment or when
making the repairs.
1)
Bring the blade to the RAISE position and run the engine under no load at low range.
2)
Bleeding air in the tilt hydraulic circuit by repeating left and right tilt operation five to ten times.
3)
Bleeding air from the bottom of RH cylinder by operating the blade to pitch forward and backward 5 to
10 times repeatedly.
4)
Bleeding air from the RH pitch cylinder by repeating the following operation 5 to 10 times. Forward pitch
- Left tilt - Right tilt - Backward pitch.
2.
Bleeding air from cylinders
1)
Run the engine at low idling, and extend and retract each cylinder 4 to 5 times. Do not operate the cylin-
der to the end of its stroke. (Stop at a point approx. 100 mm before the end of the stroke.)
2)
Next, operate each cylinder 3 to 4 times to the end of its stroke.
3)
Finally, operate each cylinder 4 to 5 times to the end of its stroke to completely remove the air.
4-40
MAINTENANCE
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