B22W-202010
4
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19
CHAPTER 4 HST SYSTEM1022H TRACTOR
4
11. Position gauges so they can be read from tractor’s
side.
12. Perform test from tractor’s side.
Make sure that the parking brake is engaged.
Place range shifting lever in neutral position.
Start engine and run at full throttle.
13. Slowly depress forward directional pedal and
observe gauge. Gauge should slowly rise to
approximately 180~
210kgf/cm
2
and relief valve
will open with an audible squealing noise if there
is a lter plugging or an insufcient supply of oil.
(at the Pa port)
14. Repeat same procedure with reverse pedal. (at the
Pb port)
Specifications : Pump pressure should reach
approximately 180~
210kgf/cm
2
in either direction
and then relieve.
If pressure will not reach 180~210kgf/cm
2
in either
direction, check charge.
• Pressure
(SEE ”CHARGE PUMP PRESSURE TEST)
1. If charge pressure is good and hydrostatic
pump pressure will not get up to relief pressure
hydrostatic pump is worn or damaged.
2. If pressure reaches 180~
210kgf/cm
2
in one
direction and not the other, one of the relief valves
is defective or the seat is leaking.
RESULTS
CAUTION
• If brake fail to prevent wheels from turning.
STOP TEST IMMEDIATELY. Repair or adjust
brakes are necessary before resuming test.
(See brake section)
K19W096A
FIG. 4-8
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