Greensmaster 3300/3400Page 6 -- 42Electrical System
Main Power, Charge Circuit (Greensmaster 3300), Glow (Greensmaster 3400) and Fan
(Greensmaster 3400) Relays
The Greensmaster TriFlex electrical system includes
severalidentical,four(4)terminalrelaysforcurrentcon-
trol. The relays are located under the right side cover
nexttothe operatorseat(Fig.52). Relayscanbe identi-
fied by a tag near the relay wire harness connector.
The main power relay provides electrical current to the
fuseblocks whenenergized bythe ignitionswitch inthe
RUN or START position. The main power relay is used
on both Greensmaster 3300 and 3400 machines.
The charge circuit relay on Greensmaster 3300 ma-
chines provides a current path for alternator output to
reach the machine’s electrical system. The charge cir-
cuit relay is energized by the Toro Electronic Controller
(TEC) when the ignition switch is in the RUN or START
position.
The glow relay on Greensmaster 3400 machines pro-
vides electrical current to the engine glow plugs when
energized by the TEC controller.
The fan relay on Greensmaster 3400 machines pro-
vides electrical current to the engine cooling fan when
energized by the TEC controller. The fan relay is ener-
gized when engine coolant temperature reaches
approximately 185
o
F(85
o
C).
The charge circuit, glow and fan relays along with their
circuit wiring should be tested as a TEC controller out-
put with the Diagnostic Display before disconnecting
andtestingtherelay(seeDiagnosticDisplayintheTrou-
bleshooting section of this chapter).
Testing
1. Park machineon alevel surface,lower cuttingunits,
stop engine, apply parking brake and remove key from
ignitionswitch.Removerightsidecovernexttooperator
seat to allow access to relays.
2. Make sure ignition switch is in the OFF position. Lo-
cate ther elay to be testedanddisconnect wire harness
electrical connector from relay. Remove relay from
bracket 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
resistanceofthemeter andtestleads.Subtractthis val-
ue from the measured value of the relay being testing.
3. Measure coil resistance between terminals 85 and
86 with a multimeter (ohms setting) (Fig. 53). Resist-
ance should be approximately 72 ohms.
4. Connectmultimeter(ohmssetting)leadstorelayter-
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should make and break
continuity between terminals 30 and 87 as +12 VDC is
applied and removed from terminal 85.
5. Disconnect voltage and leads from the relay termi-
nals. Replace relay if necessary.
6. After testing is completed, secure relay to bracket
and connect w ire harness electrical connector to relay.
7. Install right side cover next to operator seat.
1. Relay(4terminal) 2. Relay(5terminal)
Figure 52
2
1
Figure 53
86 87
85 30
85 86
87
30
To Next Page
Loading...
