Procedure for Cutting Deck Motor Case Drain
Leakage Test
6. Sitonseatandoperatetheengineatfullspeed(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.
7. 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. 29).
8.
Have another person measure flow from the case
drain line for 15 seconds, then move the PTO switch to
OFF. Open the tester flow control valve and stop the en-
gine. 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 deck motor will
run slower, produce fewer clippings, and may cause a
different appearance on the turf.
TEST RESULTS: Flow less than 0.5 GPM (less than
16
ounces (473 ml) of hydraulic fluid in 15 seconds).
9.
damaged and should be repaired or replaced.
If flow is more than 0.5 GPM, the motor is worn or
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-
10.Disconnect
tester from motor and hose. Reconnect
hose to the deck motor. Remove cap from machine fit-
ting and reconnect case drain hose.
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
11.
If required, repeat test procedure for other deck mo-
tors.
CAUTION
1
3
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 wing 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.
2
3.
Disconnect return hose from the motor to be tested
(Fig. 28). Install flow tester in series with the motor and
the disconnected return hose. Make surethe flowcon-
trol valve on tester is fully open.
Figure 28
4.
Disconnect the motor case drain hose (small diame-
1.
2.
Deck motor (RH shown)
Return hose
3. Case drain hose
ter hose) where it connects to the machine (not at the
motor).Putasteelcaponthefitting;leavethecasedrain
hose open (Fig. 29).
5.
speed. Check for hydraulic leakage and correct before
proceeding with test.
After installing flow tester,start engine and run atidle
CAUTION
Cutting deck blades will rotate with PTO switch
in ON position. Keep away from cutting decks
during test to prevent personal injury from rotat-
ing blades. Do not stand in front of the machine.
Figure 29
Groundsmaster 4100--D
Page 4 -- 35
Hydraulic System
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 4100 D |
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