Deck Lift Relay (2Wd Machines) - Toro Groundsmaster 360 Service Manual

Deck Lift Relay (2WD Machines)

The deck lift relay is used to prevent cutting deck raising
or lowering when the engine is not running. The deck lift
relay is attached to the air cleaner bracket near the rear
steering cylinder (Fig. 62). The relay can be identified by
a tag on the wire harness.
When the engine is not running, the lack of engine oil
pressure closes the engine oil pressure switch. This
closed switch allows a grounding path to energize the
deck lift relay. The energized deck lift relay prevents cur-
rent from the deck lift/lower switch so that the cutting
deck cannot be raised or lowered. When the engine is
running, engine oil pressure opens the oil pressure
switch removing the relay grounding path which de--en-
ergizes the deck lift relay. The de--energized relay al-
lows current to the deck lift/lower switch for operation of
the deck lift or lower system.
Testing
1. Park machine on a level surface, lower cutting deck,
stop engine, apply parking brake and remove key from
ignition switch. Raise and support hood.
2. Locate start relay and disconnect the machine wire
harness connector from the relay. Remove relay from
machine for easier testing.
NOTE: Prior to taking small resistance readings with a
digital multimeter, short the meter test leads together.
The meter will display a small resistance value (usually
0.5 ohms or less). This resistance is due to the internal
resistance of the meter and test leads. Subtract this val-
ue from the measured value of the relay being testing.
3. Using a multimeter (ohms setting), measure coil re-
sistance between terminals 85 and 86 (Fig. 63). Resist-
ance should be between 70 and 90 ohms.
4. Connect multimeter (ohms setting) leads to relay ter-
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay terminals 30 and 87
should have continuity as +12 VDC is applied to terminal
85. The relay terminals 30 and 87 should not have conti-
nuity as +12 VDC is removed from terminal 85.
5. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
Groundsmaster 360
6. Connect multimeter (ohms setting) leads to relay ter-
minals 30 and 87A. With terminal 86 grounded, apply
+12 VDC to terminal 85. The relay terminals 30 and 87A
should not have continuity as +12 VDC is applied to ter-
minal 85. The relay terminals 30 and 87A should have
continuity as +12 VDC is removed from terminal 85.
7. When relay testing is completed, disconnect voltage
and multimeter leads from the relay terminals. Replace
relay if necessary.
8. Secure relay to machine and connect machine wire
harness connector to relay.
9. Lower and secure hood.
1
1. Deck lift relay
1. Coil terminal
2. Common terminal
Page 5 - - 47
2
Figure 62
2. Rear steering cylinder
4
3
1
86 87A 87
85 30
1
2
Figure 63
3. Normally closed term.
4. Normally open term.
Electrical System