Manitowoc Grove CD3340B Service Manual page 172

TRANSMISSION AND TORQUE CONVERTER
Electrical Troubleshooting Chart
Problem
No drive at engine start up.
No drive and continuous
warning buzzer.
No drive.
Missing gears.
No 4th gear.
Down speed protection
does not seem to be
working.
Will not downshift and
repeating double beep
sounded
Lower gear than lever
selected.
Kickdown will not engage
and double beep sounded.
Kickdown not operating.
Machine will not perform a
reversal of direction and
repeating double beep
sounded.
Sporadic gear changes.
7-16
Possible Cause
1. Blown ECU fuse.
2. ECU connector loose.
1. Attempting to select drive with
parking brake engaged.
1. Faulty shift control.
2. Parking brake sticking.
3. Faulty transmission harness.
1. Faulty solenoid(s).
2. Faulty shift control.
3. Low oil pressures.
1. Faulty speed signal.
1. Faulty speed signal.
1. Speed too high
downshift.
1. Kickdown engaged.
1. Speed too high to engage lower
gear.
1. Faulty kickdown input.
1. Speed too high for reversal of
direction.
1. Moisture in ECU connectors.
Published 04/07/2015 Control # 569-00
1. Check ECU fuse (also check fuse to shift
lever.)
2. Check that connector is mating correctly with
ECU.
1. Release the parking brake.
1. Check control and wiring.
2. Check parking brake assembly.
3. Check harness continuity and connector.
1. Check solenoid(s) and wiring.
2. Check control and wiring.
3. Check clutch pack and mainline pressures.
1. Check speed sensor and wiring.
2. Check
distance from transfer case).
1. Check speed sensor and wiring.
for selected 1. Slow
downshift.
1. Check kickdown switch and wiring.
1. Slow machine and try to engage kickdown
again.
1. Check kickdown switch and wiring.
1. Slow machine with brakes.
2. Deselect reversal.
1. Check that connector seals are installed and
are in good condition.
CD3340B/YB4411
Remedy
speed sensor installation
machine with brakes.
(i.e.
Deselect