Problem
Possible Causes
Machine travels too far before stop-
ping when the traction pedal is re-
leased.
Traction linkage is out of adjustment.
Piston pump servo control valve is damaged.
Traction pedal does not return to neutral.
Four wheel drive will not engage.
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve in 4WD hydraulic manifold is faulty.
Cartridge valve in 4WD manifold is damaged or sticking.
Rear axle motor is damaged.
Four wheel drive will not disengage.
No cutting decks will operate.
Electrical problem exists (see Chapter 5 -- Electrical System).
Solenoid valve in 4WD/2WD control manifold is faulty.
Cartridge valve in 4WD/2WD control manifold is damaged or sticking.
Electrical problem exists (see Chapter 5 -- Electrical System).
Gear pump sections P1 and P2 are damaged.
Gear pump coupler is damaged (steering and lift/lower also affected).
System pressure to the affected deck is low.
One cutting deck will not operate.
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.
Cartridge valve in deck manifold (SV2) is damaged or sticking (GM
4700--D
decks #6 or #7).
Several cutting decks will not oper-
ate.
Electrical problem exists (see Chapter 5 -- Electrical System).
Control manifold solenoid for affected decks is faulty.
Proportional relief valve (PRV1 or PRV2) in deck control manifold is
stuck or damaged.
Gear pump section (P1 or P2) is damaged or inefficient.
Engine RPM is low.
All cutting decks operate slowly.
Cutting deck stops under load.
Deck motor is damaged.
Gear pump section (P1 or P2) is damaged or inefficient.
Relief valve in deck manifold is by--passing.
Deck motor relief valve is stuck or damaged.
Deck motor has internal leakage (by--passing oil).
Cutting deck gear pump section (P1 or P2) is inefficient.
Groundsmaster 4500--D/4700--D
Page 4 -- 23
Rev. D
Hydraulic System (Rev. A)
| Categories | Lawn Mower Manual, Sprinkler and Irrigation Manuals, Toro Sprinkler and Irrigation Manuals |
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| Tags | Toro Groundsmaster 4500 D, Toro Groundsmaster 4700 D |
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| Document Type | Service Manual |
| Language | English |
| Product Brand | Toro. Customer Service Representatives are available by phone:
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