HYDRAULICS
673831-Rev A 6-31
6
Front Reel Valve Test
See Figures 6-22 through 6-24.
• Performing this test will isolate the front reel
valve from the rest of the front cutting units
circuit.
• This test works together with the “Front Cutting
Units Circuit Test,” “Front Cutting Units Pump
Test,” and “Front Reel Motors Test” to isolate a
problem with the front cutting units circuit.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Before performing this test, perform “Front Cutting
Units Circuit Test,” leaving flow meter connected as
outlined.
Figure 6-22
3. Install blocking disk at fitting (1) on right front reel
motor, blocking oil flow from entering right front reel
motor.
Figure 6-23
4. Open flow meter valve (2) completely.
Figure 6-24: Front Reel Valve Test—Blocking Disk at
Right Front Reel Motor
5. Block both sides of rear wheels using suitable wheel
blocks.
6. Bypass seat switch.
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 (2) until a reading of 1100 psi
(75 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.
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 4000 psi (276 bar)
• -6 ORFS Tee Fitting
•-8 ORFS Blocking Disk
Do not exceed 2200 psi (251 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
54
0
0
6
0
0
0
2
4
0
0
18
0
0
1200
6
0
0
0
250
psi
BAR
0
5
1
0
1
5
2
0
25
3
0
3
5
3
00
350
4
00
45
0
5
0
0
2
0
0
1
50
1
00
5
0
0
2
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