6-30 4252490-Rev A
HYDRAULICS
6
Is steering cylinder leakage a nominal amount of
oil or less?
YES Go to step 8.
NO Repair or replace steering cylinder. (See
“Steering Cylinder” on page 7-14.)
8. Disconnect and plug hose (1).
9. Start engine and set engine speed to full throttle
(3400 rpm ± 50).
10. Turn the steering wheel fully left, then fully right.
Does the steering wheel continue to turn past
stop with little or no resistance?
YES Steering unit is faulty. Replace steering unit.
(See “Steering Unit” on page 7-6.)
NO Steering unit is good.
Reel Motor Case Drain Test
The cutting units circuit consists of the gear pump, reel
valve unit, right cutting unit, left cutting unit, and center
cutting unit. This test helps to determine if one of the reel
motors is faulty. An instrument test must be performed to
isolate the performance of the gear pump and reel valve
unit.
NOTES
• Perform test on only one reel motor at a time.
• The case drain on a hydraulic motor is used to return
lubrication or bypassed hydraulic oil to the hydraulic
tank.
1. Operate the machine until hydraulic oil reaches
operating temperature, 120–150° F (49–65° C).
2. Stop the engine and remove the key.
3. Remove case drain hose from reel motor.
Immediately plug the hose.
4. Place a drain pan with a minimum capacity of 1
gallon (3.8 L) near the reel motor.
5. Install a separate hose on the case drain fitting and
place the free end in the container. Secure the hose
to prevent spills.
!
WARNING
6. Install suitable blocking device or tool in cutting unit
being tested, preventing reel motor from turning.
7. Chock the wheels so the machine cannot roll.
8. Set park brake, start engine, release park brake, and
place mow switch in the on position for 15 seconds.
9. Stop engine and remove ignition key.
10. Measure the amount of oil that flowed from the case
drain. The amount x 4 = amount per minute.
Is the amount of oil captured from the case drain
about a half pint per minute or less?
YES The motor shaft and/or bearings are not
faulty; proceed with an instrument test. (See
“Instrument Test Procedures” on page 6-31.)
Is the amount of oil captured from the case drain
more than a pint per minute?
YES The motor may be faulty; repair or replace as
needed. (See “Reel Motor” on page 8-28.)
NO Disconnect and remove test equipment.
Install all hoses, fittings, and components as
noted prior to removal.
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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