Toro Groundsmaster 5900 Series Service Manual page 391

Testing
Groundsmaster ® 5900 & 5910
16227SL Rev B
Be aware of and keep away from rotating parts during test. Do not
wear loose clothing while working near rotating parts as these may
become entangled and cause personal injury.
1. Park machine on a level surface, lower cutting decks, engage the parking
brake, leave the engine running and open the hood.
Note: The engine must be running, no coolant or hydraulic oil temperature
warnings can be active and the parking brake needs to be engaged or an
operator must be in the seat for fan override or demo modes to be operational.
Note: The hydraulic oil cooler fans will operate at maximum speed if a
hydraulic oil temperature sender fault is active.
2. Use the InfoCenter display to enter either Fan Override Mode or Fan Demo
Mode (see SERVICE (page
If Fan Override Mode is selected, use the InfoCenter to manually control the
radiator cooling fans and/or the hydraulic oil cooler fans direction and speed.
When operating in the reverse direction, the selected fans will operate for
approximately six (6) seconds, pause for approximately nine (9) seconds
and repeat.
If Fan Demo Mode is selected, the following fan operating sequence will
begin automatically:
A. Radiator fans at maximum speed in forward direction and hydraulic oil
cooler fans at maximum speed in forward direction for one minute.
B. Radiator fans at maximum speed in reverse direction and hydraulic oil
cooler fans at maximum speed in forward direction for one minute.
C. Radiator fans at maximum speed in reverse direction and hydraulic oil
cooler fans at maximum speed in reverse direction for one minute.
D. Radiator fans at maximum speed in forward direction and hydraulic oil
cooler fans at maximum speed in reverse direction for one minute.
E. Repeat.
3. Cancel fan override or fan demo mode and return to the previous screen by
pressing button 5 or by turning the key switch to OFF.
4. If one fan in the panel is not operating correctly, exchange the fan connections
at the machine wire harness and re−enter Demo Fan Mode. If the problem
remains unchanged, a problem with the fan is likely. If the problem follows
the exchange, or both fans in the panel do not operate correctly, something
other than the fan is at fault (e.g. wire harness or connectors).
5. Use a phototach (non−contact tachometer) to compare the RPM of each fan
in a panel. The fans speeds should be within 100 RPM of each other when
operating at maximum speed.
6. Replace the fan as necessary.
7. Inspect and repair or replace any worn or damaged foam seals on either
side of the cooling fan panels.
CAUTION
6–14)).
Page 6–129 Electrical System: Component Testing