Procedure for Cutting Deck Motor Case Drain
Leakage Test
5. Sit on seat and start the engine. Move throttle to full
speed (2730 + 30 RPM). Move PTO switch to ON.
NOTE: Over aperiod oftime,adeck motor can wear in-
ternally. A worn motor may 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,
causedamage toseals andother components inthehy-
draulic system, and affect quality of cut.
6. While watching pressure gauge, slowly close flow
control valve ontester untilapressure of 1200PSIisob-
tained.
NOTE: Use a graduated container, special tool
TOR4077, to measure case drain leakage (Fig. 25).
7.
drain line for 15 seconds, then move the PTO switch to
Have another person measure flow from the case
OFF and stop the engine.
NOTE: One method to find a failing or malfunctioning
deck motor is to have another person observe the ma-
chine while mowing in dense turf. A bad motor will run
slower,producefewerclippings,andmaycauseadiffer-
ent appearance on the turf.
TEST RESULTS: Flow less than 0.5 GPM (less than
16
ounces (473ml)ofhydraulic fluidin15seconds).
8.
Disconnect tester from motor and hose. Reconnect
hose to the deck motor. Remove cap from tee--fitting
and reconnect case drain hose.
1.
perature by operating the machine for approximately 10
minutes. Make sure the hydraulic tank is full.
Make sure hydraulic oil is at normal operating tem-
9.
If flow is more than 0.5 GPM, the motor is worn or
damaged and should be repaired or replaced.
2.
Parkmachineonalevelsurfacewiththecuttingunits
lowered and off. Make sure engine is off and the parking
brake is engaged.
3
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.
2
1
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.
Figure 24
3.
Disconnect hose from return of the motor to be
1.
2.
Deck motor (RH shown)
Return hose
3. Case drain hose
tested (Fig. 24). Install flow tester in series with the mo-
tor and disconnected return hose. Make sure the flow
control valve on tester is fully open. (Fig. 25).
4.
Disconnect the motor case drain hose (small diame-
ter hose)where itconnects tohydraulic 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. 25).
CAUTION
Cutting unit blades will rotate when lowered with
PTO switch in ON position. Keep away from cut-
ting units during test to prevent personal injury
from rotating blades. Do not stand in front of the
machine.
Figure 25
Groundsmaster 4000--D
Page 4 -- 35
Hydraulic System (Rev. B)
| Categories | Lawn Mower Manual, Toro Lawn Mower Manual |
|---|---|
| Tags | Toro Groundsmaster 4000 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
| Document File Type | |
| Publisher | toro.com |
| Wikipedia's Page | Toro Company |
| Copyright | Attribution Non-commercial |
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