Procedure for Cutting Deck Motor Case Drain Leak-
age Test
5. Sit on seat and start the engine. Move throttle to full
speed (2870 RPM). Move PTO switch to ON.
NOTE: Over aperiod oftime,adeck motor can wear in-
ternally. A worn motor may bypass 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 tester 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.
7.
drain line for fifteen (15) seconds, then move the PTO
Have a second person measure flow from the case
switch to OFF and stop the engine. Record test results.
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, produce fewer clippings and may cause a differ-
ent appearance on the turf.
TEST RESULTS: Case drain leakage less than 22.4
ounces (662ml)ofhydraulicfluidin15seconds (0.7
GPM / 2.7 LPM)
8.
the motor is worn or damaged and should be repaired
or replaced.
Ifcasedrainflowismorethan 22.4ounces(662ml),
1.
Make sure hydraulic oil is at normal operating tem-
peraturebyoperatingthemachineforapproximatelyten
minutes. Make sure the hydraulic tank is full.
(10)
9.
hose to the deck motor. Remove cap from bulkhead fit-
ting and reconnect case drain hose.
Disconnect tester from motor and hose. Reconnect
2.
decks lowered and off. Make sure engine is off and the
parking brake is engaged.
Park machine on a level surface with the cutting
10.Repeat
test for additional motors if required.
CAUTION
#4
#1 Deck
#5
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 deck motors are connected in series. To
isolate a faulty motor, all motors in the circuit may have
to be tested by starting with the first motor in the circuit
(see Hydraulic Schematic).
#
GM4700)
6
#2
#3
#7
(GM4700)
(
3.
Disconnect pressure return hose from the motor to
be tested (Fig. 47). Install tester with pressure gauge
and flow meter in series with the motor and the discon-
nected return hose. Make sure the flow control valve on
tester is fully open.
CUTTING DECK LOCATIONS
Figure 46
4.
Disconnect the motor case drain hose (small diame-
ROTATION
DIRECTION
ter hose) where it connects to bulkhead fitting at the
frame rail (not at the motor). Put a steel cap on the bulk-
head fitting; leave the case drain hose open.
1
CAUTION
2
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 front of
the machine during test.
3
Figure 47
3.
1.
2.
Flow IN
Flow OUT
Case drain
Groundsmaster 4500--D/4700--D
Page 4 -- 55
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
|---|---|
| Tags | Toro Groundsmaster 30857, Toro Groundsmaster 30858, Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
| Download File |
|
| Document Type | Service Manual |
| Language | English |
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