Greensmaster 3150Page 5 -- 14Electrical System
Safety Relays
Several safety relays are used on Greensmaster 3150
machines.The safetyrelays areidentical,five (5) termi-
nal relays that are used for circuit control.
Safety Relay Function
Thestart safetyrelayensuresthat thefunctionalcontrol
lever is in neutralbefore engine starting is allowed. The
start relay is located under the control panel on the left
side of the operator seat.
When energized, the kill relay p rovides a complete cir-
cuit to allow the starter solenoid to be energized. Also,
when de--energized, the kill relay p rovides a ground for
the engine magnetos which stops the engine. The kill
relay is located under the control panel on the left side
of the operator seat.
Thechargecircuitrelayallowsalternatoroutputtoreach
the machine electrical circuits as long as the engine is
running.Thechargecircuitrelayislocatedundertheop-
erator seat.
When energized, t he lower relay allows current flow to
hydraulic solenoid coils S2 and S4 causing the cutting
units to lower. The lower relay is located under the con-
trol panel on the left side of the operator seat.
Thejoystickrelayallowscuttingunit operationwhenen-
ergized by the joystick lower switch. The joystick relay
is located under the control panel on the left side of the
operator seat.
The mow relay allows the reel engage solenoid coil
(S1R1) to be energized for cutting reel operation. The
mow relay is located under the control panel on the left
side of the operator seat.
When energized, the raise relay allows current flow to
hydraulic solenoid coils S2 and S3 causing the cutting
unitstoraise.Theraiserelayislocatedu nderthecontrol
panel on the left side of the operator seat.
Wheninbacklap, the backlaprelay prevents thecutting
reels from being engaged during engine cranking. The
backlaprelayislocatednearthefunctionalcontrollever.
NOTE: Ref er to Circuit Diagrams in Chapter 9 -- Fold-
out Drawings for additional relay operation information.
Relay Testing
1. Park machine on a level surface. Make sure the en-
gine and ignition switch are OFF.
2. Locate relay that is to be tested.
3. Disconnectwireharnessconnectorfromrelaythatis
to be tested. If desired, remove relay from machine for
testing.
NOTE: Use illustrationin Figure 13t o identify relayter-
minals.
4. Use a multimeter (ohms setting) to measure resist-
ance between the following relay terminals:
A. There should be continuity between terminals
87A and 30
B. Thereshouldnotbecontinuitybetweenterminals
87 and 30.
C. Resistance between terminals 86 and 85 (relay
coil)shouldbefrom80to90ohms.
5. Connectmultimeter(ohmssetting)leadstorelayter-
minals 30 and 87. Ground terminal 86 and apply +12
VDC to terminal 85. The relay should make and break
continuitybetweenterminals30and87as12VDCisap-
plied and removed from terminal 85.
6. Disconnect voltage from terminal 85 and multimeter
lead from terminal 87.
7. Connectmultimeter(ohmssetting)leadstorelayter-
minals 30 and 87A. Apply +12 VDC to terminal 85. The
relay should break and make continuity between termi-
nals30and87Aas12VDCisappliedandremovedfrom
terminal 85.
8. Disconnect ground, voltage and multimeter leads
from relay terminals.
9. Replace relay if testing determines that relay is
faulty.
10.When testing is complete, secure relay to machine
if it was removed. Connect wire harness connector to
relay.
Figure 13
86
85
87A 87
30
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