6-36 673831-Rev A
HYDRAULICS
6
Figure 6-31
5. Disconnect tube (7) from brake valve fitting (8) and
charge tube (9). Assemble a cap to the brake valve
fitting
6. Secure flow meter outlet hose (3) to open spud port
on charge tube (9).
7. Install suitable blocking device or tool in right rear
cutting unit, preventing the reel motor from turning.
8. Open flow meter valve (4) completely.
Figure 6-32: Rear Cutting Units Circuit Test—Right
Rear Reel Motor Blocked
9. Block both sides of rear wheels using suitable wheel
blocks.
10. Bypass seat switch.
Verify engine rpm is within specification (3000 rpm ± 50)
to ensure accurate hydraulic test results.
11. Start engine and run at full throttle (3000 rpm ± 50).
12. Use the flow meter to warm the hydraulic oil. Turn the
flow meter valve (4) 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.
13. Engage the mow switch, engage and release the
lift/lower joystick to the lower position twice, and
operate the reels.
14. Read and record the rear cutting units circuit no load
flow.
15. Slowly close flow meter valve (4) until a pressure of
1650 psi (114 bar) or 75% of the relief valve rating is
reached. Read and record the rear cutting units
circuit loaded flow.
16. Open flow meter valve, disengage mow switch, and
stop engine.
Flow meter outlet hose must be connected to
charge circuit, or damage to traction circuit
components may occur.
Safely block cutting unit from rotating using a
suitable device or tool. Failure to follow
appropriate safety precautions may result in
death or serious injury.
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