HYDRAULICS
673831-Rev A 6-47
6
Lift/Steer Pump Test
See Figures 6-48 through 6-50.
Before performing this test, perform field test procedures.
(See “Field Test Procedures” on page 6-23.)
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
Figure 6-48
2. Disconnect hose (2) from fitting (1).
Figure 6-49
3. Connect flow meter inlet test hose (5) to fitting (1).
4. Connect flow meter outlet test hose (3) to hose (2).
5. Open flow meter valve (4) completely.
Figure 6-50: Lift/Steer Pump Test
6. Engage park brake (park brake switch in the on
position).
Verify engine rpm is within specification (3000 rpm ± 50)
to ensure accurate hydraulic test results.
7. Start engine and run at full throttle (3000 rpm ± 50).
8. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (4) until a reading of 1050 psi (72
bar) or one-half of the relief valve rating is reached.
Warm oil to 120–150° F (49–65° C).
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 4000 psi (276 bar)
Do not exceed 2100 psi (145 bar) as this test does
not utilize system relief, and damage may occur
to hydraulic system components.
15
GPM
20
25
30
1
0
5
0
0
2
0
4
0
6
0
L
P
M
8
0
1
0
0
3000
psi
BAR
0
1
0
0
2
0
0
3
0
0
4
0
0
3
6
00
420
0
480
0
5
4
0
0
60
0
0
2
4
0
0
18
0
0
1
200
6
0
0
0
250
psi
BAR
0
5
1
0
1
5
2
0
2
5
3
0
3
5
3
00
350
4
00
4
5
0
50
0
2
0
0
1
50
1
00
5
0
0
3
4
5
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