B22W-202010
4
-
18
CHAPTER 4 HST SYSTEM 1022H TRACTOR
ཝ
ཛྷ
ཛ
K19W094A
FIG. 4-6
)
5
&
K19W095A
FIG. 4-7
7.2 HYDROSTATIC PUMP PRESSURE TEST
To ensure that internal parts of the hydrostatic pump
are not worn excessively, and the relief valves are
operating properly.
① Gauge spec. : Over 500 kgf/cm
2
(6,610 psi)
② Coupler spec. : 3/8” (Hose with quick coupler)
③ Adaptor spec. : UNF3/4-16 and 1/2-20
4. Start engine and run until hydraulic oil is warm.
5. Stop engine.
6. Cycle all controls to relieve any pressure that may
be in the hydraulic system
7. Locate test ports on hydrostatic transmission inside
tunnel opening.
8. Remove test port plugs.
9. Install ③ adaptor male into each test port.
10. Attach ② gauge and hose assembly as shown
each test port adapter.
1. Park tractor on a level surface
2. Turn key switch to OFF position.
3. Make sure range transmission shift lever is in
neutral position.
REASON
PROCEDURE
EQUIPMENT
IMPORTANT
•
cause system to run dry and damage pump
and motor.
• Do not allow valves to relieve for more than
10 seconds or hydraulic oil may overheat.
CAUTION
• AVOID SUDDEN TRACTOR MOVEMENT.
Tractor could move suddenly causing severe
injure or damage to equipment during test
procedure.
• Perform test in open area. Keep all personnel
away from or rear of tractor.
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