5-26 673831-Rev A
HYDROSTATIC POWER TRAIN
5
8. Stop the engine.
Is charge pressure approximately 200 psi (13.8
bar)?
YES Charge pressure relief valve is good.
Proceed to step 9.
NO Charge pump or charge pressure relief valve
is at fault. Inspect, repair, or replace charge
pressure relief valve. Inspect, repair, or
replace charge pump as needed.
9. Disconnect and remove test equipment. Install all
hoses and fittings as noted prior to removal.
10. Install and connect all components as noted prior to
test.
11. Check hydraulic oil level. Add oil as needed. (Refer to
“Safety, Operation, and Maintenance Manual” for
correct oil specifications.)
Charge Pump Test
See Figures 5-16 through 5-18.
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.)
2. Raise the hood.
Figure 5-16
3. Disconnect hose (4) from fitting (2).
Figure 5-17
4. Connect flow meter inlet test hose (1) to fitting (2).
5. Connect flow meter outlet test hose (3) to hose (4).
6. Open flow meter valve (5) completely.
Figure 5-18: Charge Pump Test
7. Put the parking brake switch in the ON position.
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
• -6 ORFS Test Hose 2000 psi (138 bar)
15
GPM
2
0
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
00
2
0
0
3
0
0
4
0
0
360
0
4
20
0
4
800
5
4
0
0
60
0
0
2
4
0
0
18
00
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
3
50
40
0
4
5
0
50
0
2
00
1
5
0
1
00
5
0
0
3
5
1
Rear
Reel
Valve
A
B
P
G
T
SOL2
SOL1
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