Toro Groundsmaster 4500-D Series Service Manual page 171

Procedure for Deck Motor Case Drain Leakage Test
Groundsmaster ® 4500-D/4700-D
19245SL Rev A
Note: Over a period of time, a deck motor can wear internally. 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,
cause damage to seals and other components in the hydraulic system and affect
quality of cut.
Note: One method to find a failing or malfunctioning deck motor is to have
another person observe the machine while mowing in dense turf. A bad motor
will run slower, produce fewer clippings and may cause a different appearance
on the turf.
Prevent personal injury and/or damage to equipment. Read all
WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the
beginning of this section.
1. Make sure hydraulic oil is at normal operating temperature by operating
the machine for approximately ten (10) minutes. Make sure the hydraulic
reservoir 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 engaged.
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 Appendix A (page
#6 Deck
(GM4700)
g308386
CAUTION
A–1)).
#4 Deck #1 Deck
#2 #3
Deck Deck
Figure 80
CUTTING DECK LOCATIONS
Page 5–69
#5 Deck
#7 Deck
(GM4700)
Hydraulic System: Testing