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GROVE
Published 1-20-2017, Control# 483-02
7-17
CD5515-2/YB5515-2 SERVICE MANUAL
TRANSMISSION AND TORQUE CONVERTER
7
(+) meter lead to the pin for the RED wire and the
negative (-) meter lead to the pin for the BLUE wire.
Move a piece of metal in front of the sensor. When the
metal passes the front of the sensor, the meter should be
registering 12 VDC. If it does not register 12 VDC,
replace the speed sensor.
6.
While the sensor is removed, check the sensor for
damage.
7.
If the sensor is working properly, the problem is most
likely in the harness itself. Repair or replace the harness.
Speed Sensor Depth
The speed sensor depth is not adjustable and is set at time
of manufacturing during case machining.
Tips On Common Problems
ECU Mounting
If the ECU mounting capscrews are overtightened the ECU
and internal components can be damaged. Hand tighten the
capscrews only.
Speed Sensors
Generally speed sensors do not fail. Most problems seen are
caused by physical damage due to transit, installation or
faulty wiring.
Occasionally sensors are out of tolerance or installed
incorrectly.
Harnesses
By far the most troublesome cause of ECU inoperability are
the wire harnesses. The integrity of the electrical connectors
and components is paramount to problem free operation.
It has been noticed that water entry into the shift control
assembly can occur if the control is damaged (replace the
control). This is particularly important on open cab cranes. It
is possible that the water can short internal switches
providing false signals to the ECU. If water is trapped in the
control it can corrode internal switch contacts making them
stick on or off.
Moisture or contamination trapped in connectors is a
probable cause of many faults.
However effective an electrical connector, it can not be
expected to sustain direct steam cleaning using high
pressure hoses. It is recommended that operators should
make themselves aware of connectors which are vulnerable
to a direct jet from a steam cleaner and avoid continued
contact.
Poor ground of electrical components can cause problems.
Check that the grounding to the ECU, shift control and other
switches is sound.
No 4th Gear
There are two main causes for this problem:
•
The speed sensor is inoperable (Check speed sensor
and installation).
•
Shift control switch contact or wiring problems.
Erratic/Sticking Gears
It is possible that a mechanical issue is the cause of this
problem. A known problem is if the transmission has at some
point suffered coolant failure and water has entered the
transmission. If the original plastic clutch pistons are still
being used then there is a risk that they will stick.
Reference Only
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