JLG G6-42P Service Manual - Manual (Page 433)

RICERCA GUASTI
Mod. 28.46M TROUBLESHOOTING
LA10077
E.1
PAG . 78
REVISION DATE : 00/00 P / N : CA357248
E.1 Troubleshooting
This chapter is a descriptive and explanatory guide to common axle problems. This guide suggests the correct repair
procedures to be followed.
Problem Cause Action
Ring gear tooth broken on the outer side 1. Excessive gear load compared to the
one foreseen
2. Incorrect gear adjustment (excessive
backlash)
3. Pinion nut loosened
Replace bevel gear set
Follow carefully the recommended
operations for the adjustment of bevel
gear set backlash
Ring gear tooth broken on the inner side 1. Load bump
2. Incorrect gear adjustment (insufficient
backlash)
3. Pinion nut loosened
Replace bevel gear set
Follow carefully the recommended
operations for the adjustment of bevel
gear set backlash.
Pinion or ring gear teeth worn 1. Insufficient lubrication
2. Contaminated oil
3. Incorrect lubrication or depleted
additives
4. Worn out pinion bearings that cause
an incorrect pinion axle backlash and
wrong contact between pinion and ring. Replace bevel gear set.
Follow carefully the recommended
operations for the adjustment of bevel
gear set backlash.
Use correct lubricants, fill up to the right
levels and replace according to the
recommended program.
Overheated ring and pinion teeth. See if
gear teeth have faded 1. Prolong ed functioning at high
temperatures
2. Incorrect lubrication
3. Low oil level
4. Contaminated oil Replace bevel gear set.
Use proper lubrication, fill up to right level
and replace at recommended program.
Pinion teeth pitting 1. Excessive use
2. Insufficient lubrication Replace bevel gear set.
Use correct lubrication, fill up to the right
level and substitute at recommended
intervals
Axle beam body bent 1. Vehicle over loaded
2. Vehicle's accident
3. Load bump Replace axle beam body
Worn out or pitted bearings 1. Insufficient lubrication
2. Contaminated oil
3. Excessive use
4. Normal wear out
5. Pinion nut loosened Replace bearings.
Use correct lubrication fill up, to the right
level and replace at recommended
intervals
Oil leakage form gaskets and seals 1. Prolonged functioning at high
temperature of the oil
2. Oil gasket assembled incorrectly
3. Seal lip damaged
4. Contaminated oil Replace the gasket or seal and matching
surface if damaged.
Use correct lubrication and replace at
recommended intervals.
Excessive wearing out of input flange
spline 1. Exhaustive use
2. Pinion nut loosened
3. Pinion axle backlash Replace the flange.
Check that the pinion spline is not
excessively worn out.
Replace bevel gear set if required.
Fatigue failure of pinion teeth
See if the fracture line is well defined
(wave lines, beach lines) 1. Exhaustive use
2. Continuous overload Replace bevel gear set
Pinion and ring teeth breakage 1. Crash load of differential components Check and/or replace other differential
components.