Engine Cooling Fan Circuit Problems - Toro Groundsmaster 4500-D Series Service Manual

Engine Cooling Fan Circuit Problems

Groundsmaster ® 4500-D/4700-D
19245SL Rev A
Problem
Cooling fan runs only in forward direction (fan
does not run in reverse direction).
Cooling fan does not rotate.
Cooling fan always rotates at slow speed.
Cooling fan always rotates at fast speed.
Possible Cause
Fan control manifold solenoid cartridge valve
(S1) is faulty.
Electrical problem exists that prevents fan
control manifold solenoid valve (S1) operation
(see Chapter 6: Electrical System (page
Cooling fan motor is worn or damaged.
Last gear pump section is worn or damaged.
Fan control manifold cartridge valve seals are
leaking.
Check valve in combination manifold is not
seating.
Fan control manifold proportional relief valve
(PRV) is stuck open.
Hydraulic fan motor is worn or damaged.
Fan control manifold proportional relief valve
(PRV) is faulty.
Electrical problems exists that prevents correct
operation of combination manifold proportional
relief valve (PRV) (see
System (page
Page 3–9
6–1)).
Chapter 6: Electrical
6–1)).
Troubleshooting: