Grove Published 11-22-2016, Control # 345-12 3-7
RT9130E-2 SERVICE MANUAL ELECTRICAL SYSTEM
d. If the starter turns the engine, but it still won’t start,
check fuses F1, 54, 55, 56, and 57 in the battery
box. Replace if required. Ensure fuel system can
draw fuel from the tank and pump it to the engine;
make repairs as needed. Also check engine ECM
connector pin 3 to insure it has 12v with ignition
switch in the ON position and START position.
7. Refer to the engine manual for further instructions.
NOTE: If the starter won’t disengage during running, verify
the starter is mounted properly so its gear won’t
mesh with the engine’s flywheel when not trying to
start engine. Troubleshoot the starter relay and
ignition switch for closed contacts. If these
components check out, replace the starter.
Troubleshooting Engine Charging Problems
1. Verify battery terminals are connected and clean and all
wires in the charging system are in good repair and are
connected properly.
2. Verify the alternator belt is properly installed and is
properly tensioned.
3. Verify each battery puts out 12 volts minimum. Charge
batteries as needed so they can supply a minimum
excitation voltage to the engine’s charging system.
4. Verify there is a minimum of 12 volts at the alternator
from the batteries, and that the alternator is properly
grounded.
5. Replace the alternator if the other conditions check out.
6. Refer to the engine manual for further instructions.
NOTE: If the alternator runs noisily, check belt tension. If
problem persists, replace alternator.
If the alternator overcharges (voltmeter reads high,
light bulbs burn out quickly), look for a ground
where one shouldn’t exist. If external wiring checks
out, replace alternator. (The alternator probably
has an internal ground or a faulty internal voltage
regulator.)
Troubleshooting Accessories
If the crane’s engine starts and charges properly, but none of
its components except the horn or lights work, the accessory
circuitry may be faulty. Check as follows:
1. Turn the ignition switch to the ACC (3) position. Try to
turn on the cab circulating fan, the windshield wipers or
skylight wiper. If none of these come on (but the head
lights, tail lights, marker lights, dome light, work light, or
gauge lights and panel lights will come on), there is an
accessory circuitry problem.
2. Check the primary power circuit to the accessory relays
KS1 and KS2. Make circuit repairs as needed.
3. If the problem remains, check the ignition switch and the
accessory control circuit from the ignition switch through
the coil of the accessory relays KS1 and KS2 to ground.
Turn the ignition switch to the ACC (3) position and listen
for audible click of relays KS1 and KS2. If neither relay
clicks, then there is no power through the switch when it
is in the ACC (3) position. Replace ignition switch if there
is no power through it when in the ACC (3) position. If
one relay clicks and the other does not, check continuity
of the coil of the relay that does not click. If there is no
continuity through its coil, replace the relay. Make circuit
repairs to accessory control circuit as needed.
4. If the problem remains, check the accessory relay KS1
or KS2 contacts and the accessory power circuit.
Replace relay if its contacts stay open when the coil is
energized. Make circuit repairs as needed.
Troubleshooting Swivel-Caused Electrical
Problems
Many crane component electrical troubles can be traced to
the electrical swivel. Troubles common to the swivel are
improper mounting, foreign material between the brushes
and slip rings, incorrect wiring from the swivel to the
components, incorrect wire size, worn brushes, improper
spring tension on the brush assembly, and loose setscrews
on the slip ring assembly. Refer to the electrical schematic
and wiring diagram for slip ring connections and amperages.
Connector Troubleshooting
The cause of an electrical problem may be a loose or
corroded connection in the pin or socket connectors. Check
the connectors to ensure that the pins and sockets are
properly seated and engaged. If the pins and sockets show
any signs of corrosion, use a good quality electrical contact
cleaner or fine sandpaper to clean them. When the pins or
sockets show signs of arcing or burning, it will probably be
necessary to replace them.
After cutting the pin or socket off, the wire will most likely be
too short. Using a wire that is too short will allow pressure to
be applied to the pin or socket and wire where they are
crimped when the pin or socket is inserted in the plug or
receptacle. Add a short length of the same size wire to the
short wire by crimp splice or solder. Use heat shrinkable
tubing or other suitable material to insulate the splice.
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