6-40 673831-Rev A
HYDRAULICS
6
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 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 the mow switch, engage and release the
lift/lower joystick to the lower position twice, and
operate the reels.
10. Slowly close flow meter valve (2) until a pressure of
1650 psi (114 bar) or 75% of the relief valve rating is
reached. Read and record the rear reel valve loaded
flow.
11. Open flow meter valve, disengage mow switch, and
stop engine.
12. Calculate rear reel valve leakage.
(Step 9 of previous test – Step 10 / Step 9 of
previous test x 100 = Leak Percentage)
Is rear reel valve leakage 10% or less?
YES The rear reel valve is good. Proceed to
step 13.
NO Proceed to next question.
Is rear reel valve leakage 11% to 20%?
YES The rear reel valve is marginal. Additional
testing is required. Proceed to step 13.
NO Proceed to next question.
Is rear reel valve leakage 21% or more?
YES Repair or replace reel valve. See “Reel
Valves” on page 6-55, then proceed to
step 13.
13. (See Figure 6-36.) Disconnect hydraulic hose at
fitting (1) on right rear reel motor and remove
blocking disk.
14. Reconnect hydraulic hose to right rear reel motor.
15. Proceed to “Rear Reel Motors Test” on page 6-40.
Rear Reel Motors Test
See Figures 6-39 through 6-41.
• Performing this test will isolate the rear reel
motors from the rest of the rear cutting units
circuit.
• This test works together with the “Rear Cutting
Units Circuit Test,” “Rear Cutting Units Pump
Test,” and “Rear Reel Valve Test” to isolate a
problem with the rear cutting units circuit.
1. Park the mower safely. (See “Park Mower Safely” on
page 1-6.)
2. Before performing this test, perform “Rear Reel Valve
Test,” leaving flow meter connected as outlined.
3. Install suitable blocking device or tool in right rear
cutting unit, preventing the reel motor from turning.
4. Block both sides of rear wheels using suitable wheel
blocks.
5. Bypass seat switch.
Figure 6-39
6. Open flow meter valve (1) completely.
Do not exceed 2200 psi (251 bar) as this test does
not utilize system relief, and damage may occur
to hydraulic system components.
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
• Blocking Device or Tool
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
100
2
0
0
3
00
4
0
0
3
6
00
420
0
48
0
0
5
4
0
0
6
0
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
25
3
0
3
5
3
00
350
4
00
4
5
0
5
0
0
2
0
0
1
50
1
00
50
0
1
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