Groundsmaster 4500--D/4700--D Hydraulic SystemPage 4 -- 37
PTO Problems
Problem Possible Cause
No cutting decks will operate.
NOTE: Deckshavetobefullylow-
ered and traction speed needs to be
in low speed (4WD) for decks to op-
erate.
Decks are not fully lowered to ground.
Operator seat is unoccupied.
Traction system is in high speed (2WD).
Electrical problem exists that prevents deck control manifold sole-
noid valve operation (see Chapter 5 -- Electrical System).
Gear pump sections P1 and P2 are damaged.
Gear pump coupler is damaged (other hydraulic circuits will be af-
fected as well).
One cutting deck will not operate. System pressure to the affected deck motor is low.
Cutting deck problem exists (see Chapter 8 -- Cutting Decks).
Spline on affected deck motor (or spindle) is damaged.
Deck motor relief v alve is stuck or damaged.
Deck motor is damaged. NOTE: If appropriate, transfer a suspected
damaged motor to another cutting deck. If problem follows the motor,
motor needs repair or replacement.
On GM 4700--D, deck not fully lowered to ground (decks #6 and #7).
On GM 4700--D, cartridge valve SV1 or SV2 in deck control manifold
is damaged or sticking (decks #6 and #7).
Several cutting decks will not oper-
ate.
Electrical problem exists that prevents deck control manifold sole-
noid valve operation (see Chapter 5 -- Electrical System).
Decks are not fully lowered to ground.
Deck control manifold solenoid cartridge valve (PRV1 or PRV2) for
affected decks is faulty.
Logic cartridge valve (LC1 or LC2) in deck c ontrol manifold is stuck
or damaged.
Gear pump section (P1 or P2) is worn or damaged.
Hydraulic
System
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