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Rev. A
Groundsmaster 4000--D Hydraulic SystemPage 4 -- 47
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 may by--pass oil to its case drain
causing the motor t o 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.
1. Make sure hydraulic oil is at normal operating tem-
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
2. Park machine on a level surface with the cutting
decks lowered and off. Make sure engine is off and the
parking brake is applied.
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.
NOTE: The side deck motors are connected in series.
To isolate a faulty motor, both motors in the circuit may
have to be tested by starting with the left side motor first.
3. Disconnect hose from return of the motor to be
tested (Fig. 36). Install flow tester in series with the m o-
tor and disconnected return hose. Make sure the flow
control valve on tester is fully open. (Fig. 37).
4. 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 ( Fig. 37).
CAUTION
Cutting deck blades will rotate when lowered
with PTO switch in ON position. Keep away from
cutting decks during test to prevent personal in-
jury from rotating blades. Do not stand in f ront of
the machine.
5. Sit on seat and start the engine. Move throttle to full
speed (2870 RPM). Move PTO switch to ON.
6. While watching pressure gauge, slowly close flow
control valve on tester until a p ressure of 1200 PSI (83
bar) is obtained.
NOTE: Use a graduated container, special tool
TOR4077, to measure case drain leakage (Fig. 37).
7. 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. Record test results.
TEST RESULTS: Flow less than 22.4 ounces (662
ml) of hydraulic fluid in 15 seconds.
8. If flow is more than 22.4 ounces (662 ml),themotor
is worn or damaged and should be repaired or replaced.
9. 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.
1. Deck motor (RH shown)
2. Return hose
3. Case drain hose
Figure 36
1
3
2
Figure 37
Hydraulic
System