GROVE Published 1-20-2017, Control# 483-02 7-13
CD5515-2/YB5515-2 SERVICE MANUAL TRANSMISSION AND TORQUE CONVERTER
Finding Electrical Problems
It is possible to carry out a large portion of the ECU
diagnostics with basic workshop tools, such as a test lamp
and/or voltmeter.
Checking Solenoid Operation
The correct operation can be confirmed as follows:
1. Chock the wheels.
2. Disable the crane neutral start protection to prevent the
engine from starting. This can be accomplished by
removing the neutral start relay located beneath the
dash Figure 7-12.
Machine will not perform a reversal of
direction and repeating double beep
sounded.
1. Speed too high for reversal of
direction.
1. Slow crane with brakes. Deselect
reversal.
Sporadic gear changes. 1. Moisture in ECU connectors. 1. Check that connector seals are
installed and are in good condition.
Problem Possible Cause Remedy
CAUTION
Never check for voltage directly across any pins on the
ECU. Internal damage can result from shorting pins.
Gear Selection Solenoids
Forward 1st
Forward Low (SV6) and
Layshaft (SV3)
Forward 2nd
Forward High (SV5) and
Layshaft (SV3)
Forward 3rd
Forward Low (SV6) and
Mainshaft (SV4)
Forward 4th
Forward High (SV5) and
Mainshaft (SV4)
Reverse 1st
Reverse Low (SV1) and
Layshaft (SV3)
Reverse 2nd
Reverse High (SV2) and
Layshaft (SV3)
Reverse 3rd
Reverse Low (SV1) and
Mainshaft (SV4)
Reverse 4th
Reverse High (SV2) and
Mainshaft (SV4)
FIGURE 7-11
a0797
SV1Reverse Low
SV2Reverse High
SV3Layshaft
SV4Main Shaft
SV5Forward High
SV6Forward Low
FIGURE 7-12
p0715
Neutral Start
Relay
Reference Only
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