Toro Groundsmaster 4700-D Service Manual page 71

PTO Problems
Problem
No cutting decks will operate.
NOTE: Decks have to be fully low-
ered and traction speed needs to be
in low speed (4WD) for decks to op-
erate.
One cutting deck will not operate.
Several cutting decks will not oper-
ate.
Groundsmaster 4500--D/4700--D
Possible Cause
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).
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 valve 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).
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 control manifold is stuck
or damaged.
Gear pump section (P1 or P2) is worn or damaged.
Page 4 - - 37 Hydraulic System