Textron JACOBSEN GP400, Technical/Repair Manual

Page: 226 / 354

6-34 4252490-Rev A
HYDRAULICS
6
Figure 6-25
Figure 6-26
3. Install blocking disk between hydraulic hose (1) and
tee fitting (3).
4. Open flow meter valve (2) completely.
Figure 6-27: Gear Pump Test—Blocking Disk
Between Pump and Reel Valve Unit
5. Block each side of rear wheels using suitable wheel
blocks.
6. Bypass seat switch and release park brake.
NOTE
Verify engine rpm is within specification (3400 rpm ± 50)
to ensure accurate hydraulic test results.
7. Start engine and run at full throttle (3400 rpm ± 50).
!
CAUTION
8. Use the flow meter to warm the hydraulic oil. Turn
flow meter valve until a reading of 1500 psi (103 bar)
or 50% of the relief valve rating is reached. Warm oil
to 120–150° F (49–65° C); open valve fully after
operating temperature is reached.
9. Engage mow switch.
10. Slowly close flow meter valve until pressure reaches
2200 psi (152 bar) or 75% of the relief valve rating is
reached. Read and record the gear pump loaded
flow.
11. Open flow meter valve, disengage mow switch, and
stop engine.
TN3796
1
3
TN1363
2
Do not exceed 3020 psi (208 bar) as this test does
not utilize system relief and damage may occur to
hydraulic system components.
TN3098