Toro Groundsmaster 5900 Series Service Manual page 168

Procedure for Gear Pump Flow Test
Hydraulic System: Testing
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1. First gear pump section (side decks)
2. 2 nd gear pump section (front deck)
The gear pump flow test should be performed to make sure that the mow,
steering, cutting deck lift/lower and traction charge circuits have adequate
hydraulic flow. Gear pump sections are illustrated in
pump section provides hydraulic flow for both wing cutting decks. The second
gear pump section provides hydraulic flow for the front cutting deck. The third
gear pump section provides hydraulic flow for the steering, deck lift/lower and
traction charge circuits.
Note: Over a period of time, the gears and wear plates in the gear pump can
wear. A worn pump will by pass oil and make the pump less efficient. Eventually,
enough oil loss will occur to cause circuit problems (e.g. cutting deck motors
stalling under heavy cutting conditions, lift or steering problems). Continued
operation with a worn, inefficient gear pump can generate excessive heat and
cause damage to the seals and other components in the hydraulic system.
Prevent personal injury and/or damage to equipment. Read all
WARNINGS, CAUTIONS and Precautions for Hydraulic Testing at the
beginning of this section.
1. Park machine on a level surface, lower cutting decks fully, disengage PTO
and stop engine. Remove key from key switch.
1
2
3
Figure 73
3. 3 rd
charge)
CAUTION
Page 5–68
gear pump section (steering, lift/lower,
Figure 73. The first gear
Groundsmaster ®
16227SL Rev B
5900 & 5910