Textron Jacobsen SLF530, Repair Manual

Page: 220 / 352

6-26 673831-Rev A
HYDRAULICS
6
Reel Motor Case Drain Test
The cutting units system consists of two circuits: the front
cutting units circuit and the rear cutting units circuit. The
front cutting units circuit consists of the gear pump
section 3, front reel valve, right front reel motor, center
reel motor, and left front reel motor. The rear cutting units
circuit consists of the gear pump section 2, rear reel
valve, right rear reel motor, and left rear reel motor. 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 cutting units pumps and reel valves.
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 back 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. Bypass the seat switch.
4. Remove the case drain hose from the reel motor.
Immediately plug the hose.
5. Position a drain pan with a minimum capacity of
1 gallon (3.
8 L) near the reel motor.
6. Install a separate hose on the case drain fitting and
place the free end in the container. Secure the hose
to prevent spills.

WARNING
7. Install suitable blocking device or tool in cutting unit
being tested, preventing cutting unit from turning.
8 . Engage the park brake (park brake switch in the on
position) and start the engine.
9. Engage the mow switch, engage and release the
lift/lower joystick to the lower position twice, and
operate the reels for 15 seconds.
10. Disengage the mow switch, stop the engine, and
remove the ignition key.
11. Measure the amount of oil that flowed from the case
drain. The amount x 4 = amount per minute.
Is the oil captured from the case drain within a
half pint per minute?
YES The motor shaft and/or bearings are not
faulty; proceed with an instrument test. (See
“Instrument Test Procedures” on page 6-27.)
Is the oil captured from the case drain more than
1 pint per minute?
YES The motor may be faulty; repair or replace as
needed. (See “Reel Drive Motor” on
page 8-24.)
12. 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.