Troubleshooting - JLG G6-42A Supplemental Repair Manual

Mod. 26.25M FR
F.1 Troubleshooting
This chapter is a descriptive and explanatory guide to common axle problems. This guide suggests the repair correct
procedures to be followed.
Problem
Ring gear tooth broken at the outer side 1. Excessive gear load compared to the
Ring gear tooth broken side
Pinion or ring gear teeth or worn
Overheated ring and pinion teeth. See if
gear teeth have faded
Pinion teeth pitting
Axle beam body bent
Worn out or pitted bearings
Oil leakage form gaskets and seals
Excessive wearing out of input flange
spline
Fatigue failure of pinion teeth
See if the fracture line is well defined
(wave lines, beach lines)
Pinion and ring teeth breakage
Cause
one foreseen
2. Incorrect gear adjustment (excessive
backlash)
3. Pinion nut loosened
1. Load bump
2. Incorrect gear adjustment (insufficient
backlash)
3. Pinion nut loosened
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.
1. Prolong ed functioning at high
temperatures
2. Incorrect lubrication
3. Low oil level
4. Contaminated oil
1. Excessive use
2. Insufficient lubrication
1. Vehicle over loaded
2. Vehicle's accident
3. Load bump
1. Insufficient lubrication
2. Contaminated oil
3. Excessive use
4. Normal wear out
5. Pinion nut loosened
1. Prolonged functioning at high
temperature of the oil
2. Oil gasket assembled incorrectly
3. Seal lip damaged
4. Contaminated oil
1. Exhaustive use
2. Pinion nut loosened
3. Pinion axle backlash
1. Exhaustive use
2. Continuos overload
1. Crash load of differential components
: 00/00 / : CA357152
REVISION DATE P N
RICERCA GUASTI

TROUBLESHOOTING

Action
Replace bevel gear set
Follow carefully the recommended
operations for the adjustment of bevel
gear set backlash
Replace bevel gear set
Follow carefully the recommended
operations for the adjustment of bevel
gear set backlash.
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.
Replace bevel gear set.
Use proper lubrication, fill up to right level
and replace at recommended program.
Replace bevel gear set.
Use correct lubrication, fill up to the right
level and substitute at recommended
intervals
Replace axle beam body
Replace bearings.
Use correct lubrication fill up, to the right
level and replace at recommended
intervals
Replace the gasket or seal and matching
surface if damaged.
Use correct lubrication and replace at
recommended intervals.
Replace the flange.
Check that the pinion spline is not
excessively worn out.
Replace bevel gear set if required.
Replace bevel gear set
Check and/or replace other differential
components.
F.1 . 88
PAG