Leakage Test - Toro Reelmaster 7000-D Service Manual

Cutting Unit Circuit − Cutting Unit Motor Case Drain

Leakage Test

The reel motor efficiency/case drain test is the second
in a series of tests recommended to check cutting unit
circuit performance. Over a period of time, a reel motor
can wear internally. This test measures case drain
volume while restricting flow across the motor ports.
Case drain volume under load of more than 9% of total
motor flow indicates the gears and wear plates in the
motor have worn. A worn motor may by−pass hydraulic
fluid to its case drain causing the motor to be less effi-
cient. Eventually, enough fluid loss will cause the reel
motor to stall under heavy cutting conditions. Continued
operation with a worn, inefficient motor can generate ex-
cessive heat, cause damage to seals and other com-
ponents in the hydraulic system, and affect quality of cut.
NOTE: One method to find a failing or malfunctioning
cutting unit motor is to have another person observe the
machine while mowing in dense turf. A bad motor will run
slower, produce fewer clippings and may cause a differ-
ent appearance on the turf.
The cutting unit motors are connected in series. Hy-
draulic oil passes through each reel motor from the front
to the rear. The front cutting unit motors are one series
powered by gear pump section P2, and the rear cutting
unit motors are in another series powered by gear pump
P3. If a faulty reel motor is not obvious (based on quality
of cut issues) you may have to test all the reel motors in
the series. When testing all reel motors in a circuit, start
with the first motor in the series (see Hydraulic Schemat-
ic).
Special Equipment Required:
S 15 GPM (56 LPM) Hydraulic Tester (Pressure
and Flow) with hoses − 1 − 14
S Hydraulic Cap − 11/16 −16
S Phototach (non−contact tachometer)
1. Park the machine on a level surface with the cutting
units lowered and the reel enable/disable switch in the
DISABLE position. Make sure engine is off and the park-
ing brake is disengaged. The backlap levers on the mow
control manifold should be in the mow (F) position.
CAUTION
Prevent personal injury and/or damage to equip-
ment. Read all WARNINGS, CAUTIONS and Pre-
cautions for Hydraulic Testing at the beginning
of this section.
Reelmaster 7000−D
IMPORTANT: Make sure that the oil flow indicator
on the tester matches the flow of oil (hydraulic mo-
tor > tester > disconnected hose).
2. Disconnect the return hose from the motor (hose at
the rear of the reel motor) and install a hydraulic tester
between the motor and the disconnected return hose.
Make sure the tester flow control valve is fully open.
3. Start engine and run at low idle speed. Check for hy-
draulic leaks at tester connections and make correc-
tions if necessary before proceeding with test.
4. Set throttle to high speed.
A. Use the InfoCenter display to verify engine RPM
on units with Yanmar diesel engines (2850 RPM).
B. Use a phototach to verify engine RPM on units
with Kubota diesel engines (2850 +50/−120 RPM).
5. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately ten
(10) minutes.
6. Use the InfoCenter display to record the current reel
speed settings. Set the circuit being tested (front or rear)
reel speed to maximum and stop the engine.
7. Disconnect the motor case drain hose (small diam-
eter hose) where it connects to bulkhead fitting at the
frame rail (not at the motor). Install a hydraulic cap on the
bulkhead fitting to prevent system contamination.
8. Place open end of disconnected case drain hose into
a drain pan.
9. Two people are required to complete the following
steps. One person should sit in the operator's seat and
operate the machine while another person reads the
tester and measures reel motor case drain volume.
Cutting unit blades will rotate when lowered with
enable/disable switch in ENABLE position. Keep
away from cutting units during test to prevent
personal injury from rotating blades. Do not
stand in front of the machine during test.
10.Sit in the operator's seat, set the mow speed limiter
to the LOW speed (mow) position, and release the park-
ing brake.
11. Start the engine and set the throttle to high idle
speed.
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CAUTION
Hydraulic System