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Groundsmaster 4100--D/4110--D Hydraulic SystemPage 4 -- 57
Procedure for Cutting Deck Motor Case
Drain
Leakage
Test
NOTE: Over a period of time, a deck motor can wear in-
ternally. A worn motor m ay by--pass oil to its case drain
causing the motor to be less efficient. Eventually,
enough oil loss will cause the deck motor to stall under
heavy cutting conditions. Continued operation with a
worn, inefficient motor can generate excessive heat,
cause damage to seals and other components in the hy-
draulic system and affect quality of cut.
NOTE: Onemethodtofindafailingormalfunctioning
deck motor is to have another person observe the ma-
chine while mowing in dense turf. A bad motor will run
slower, produce fewer clippings and may cause a differ-
ent appearance on the turf.
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.
1. Park machine on a level surface with the cutting deck
lowered and off. Make sure hydraulic oil is at normal op-
erating temperature, engine is off and the parking brake
is applied.
NOTE: The wing deck motors are connected in series.
To isolate a faulty wing deck motor, both motors in the
circuit may have to be tested by starting with the left side
motor first.
2. Disconnect hose from return of the motor to be
tested (Fig. 40). I nstall tester (flow and pressure) in se-
ries with the motor and disconnected return hose. Make
sure the flow control valve on tester is fully open.
3. Disconnect the motor case drain hose (small diame-
ter hose) where it connects to hydraulic manifold tee fit-
ting (not at the motor). Put a steel cap on the fitting at the
tee fitting; leave the case drain hose open.
CAUTION
Cutting deck blades will rotate when cutting
deck is lowered with PTO switch in ON position.
Keep away from cutting deck during test to pre-
vent personal injury from rotating blades. Do not
stand in front of the machine.
4. Sit on s eat and start the engine. With enginerunning,
increase engine speed to high idle speed and release
the parking brake. Engage the cutting deck.
5. While watching pressure gauge, slowly close flow
control valve on tester until a pressure of 1200 PSI (83
bar) is obtained.
NOTE: Use a graduated container, special tool
TOR4077, to measure case drain leakage (Fig. 41).
6. Have a second person collect the flow from the case
drain line for 15 seconds, then move the PTO switch to
OFF and stop the engine (Fig. 41). Record test results.
TEST RESULTS: Flow less than 22.4 ounces (662
ml) (0.7 GPM/2.6 LPM) of hydraulic fluid in 15 sec-
onds.
7. If flow is more than 22.4 ounces (662 ml) (0.7
GPM/2.6 LPM) in 15 seconds, the motor is worn or dam-
aged and should be repaired or replaced.
8. After testing is completed, disconnect tester from
motor and hose. Reconnect hose to the deck motor. Re-
move cap from tee fitting and reconnect case drain hose
to tee fitting.
1. Deck motor (RH shown)
2. Return hose
3. Case drain hose
Figure 40
1
3
2
Figure 41
Hydraulic
System