6-32 4181383 First Edition
HYDRAULICS
6
18. Install and connect all components as noted prior to
test.
19. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Rear Cutting Units Pump Test
See Figures 6-25 and 6-26.
!
WARNING
1. Park the mower safely. (See “Park Mower Safely” on
page 1-5.)
2. Before performing this test, perform rear cutting units
circuit test, leaving flow meter connected as outlined.
Figure 6-25
Figure 6-26
3. Install blocking disk between hose (1) and tee fitting
(3).
4. Open flow meter valve (2) completely.
5. Bypass seat switch.
NOTE
Verify engine rpm is within specification (2850 rpm ± 50)
to ensure accurate hydraulic test results.
6. Start engine and run at full throttle (2850 rpm ± 50).
7. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve until a reading of 1300 psi (90 bar)
or one half of the relief valve rating is reached. Warm
oil to 120—150°F (49—65°C); open valve fully after
operating temperature is reached.
!
CAUTION
8. Slowly close flow meter valve until pressure reaches
1950 psi (134 bar). Read and record the rear cutting
units pump loaded flow.
9. Stop engine.
The hydraulic system is under pressure, and the
oil will be hot.
• Always relieve pressure in the hydraulic
system before performing service.
• Failure to follow appropriate safety
precautions may result in death or serious
injury.
Required Tools and Materials
• Flow Meter
• -8 ORFS Test Hose 3000 psi (207 bar)
• -8 ORFS Tee Fitting
• -8 ORFS Blocking Disk
TN1410
1
Do not exceed 1950 psi (134 bar) when testing
pump or equipment damage may occur.
3
TN1363
2
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