Spicer Drive Axles Service Manual Axle Shift Systems, 2-Speed Single Rear Axles - Manual (Page 8)

5
Electric Shift System
Troubleshooting
Troubleshooting Guide
This chart begins with an improperly operating shift unit. Use with illustrations on pages 3, 4 and 6 to help isolate the problem.
Follow the possible solutions as an aid to system repair.
• Replace worn components.
• Repeat troubleshooting procedure.
Axle doesn’t shift ranges.
• Check the circuit breaker.
• Is the circuit breaker closed?
No Yes
Check for power at the shift unit
connector.
• Is there a voltage reading of 9V
or more?
• Reset circuit breaker or
replace fuse.
• Repeat troubleshooting procedure.
No Yes
Remove shift unit from axle and
apply voltage.
• Does unit shift properly? • Check the battery, cab switch,
wire harness, and connectors.
• Repeat troubleshooting procedure.
No Yes
Inspect slider block from bottom
of shift unit. See page 4
• Check to see if slider block is loose
or missing.
• Is slider block in good operating
condition?
• Disassemble and service shift unit.
(See page 8)
• Repeat troubleshooting procedure.
No Yes
Inspect appearance of shift fork
and check fit with depth card.
• Does the fork match the depth
card output? (See page 6) • Replace slider block assembly
(See page 8)
• Repeat troubleshooting procedure.
No Yes
Remove and inspect axle shift parts.
• Are engagement surfaces severely
worn, chipped or broken? • Rework or replace shift fork.
• Repeat troubleshooting procedure.
No Yes
End of diagnostics