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TROUBLE SHOOTING:
In normal trailer operating service, certain components such as shafts, bushings, bearings, gears, and
screw and nut assemblies are subject to wear and will require replacement.
However, under extreme usage condition exceeding AAR-931 Durability Requirements the same
components may require replacement more frequently.
Landing gears hard to crank–check the following:
PROBLEM
1. Cross driveshaft in a bind or tight
between shafts.
2. To determine which leg turns hard
3. Inadequate lubrication.
4. Alignment.
5. Upper housing or retracting tube may be bent.
6. Screw and nut assembly may have excessive
wear and be hard to turn or inoperable.
7. Check for proper clearance between pinion
and bevel gear.
8. Excessive wear or damage to pinion, bevel,
input, idler and/or output gears.
9. Landing gear jack shafts and/or shift shaft
binding.
10. Bent retracting screw.
11. Damaged thrust bearing.
12. Damaged collar.
13. Damaged shift lock boss and/or shaft
bearing boss.
14. Weld blow through where strut bracket is
welded to housing. (With no-load on landing
gear, the retract tube should have free play
inside housing.)
15. Impact to jack shaft end has pressed bearing
boss into gearbox half.
Trouble Shooting/General:
1. Right-hand leg (gearbox leg) operates but
left-hand leg does not move.
2. Legs will not operate when turning jack shaft.
3. Right-hand leg will not operate, shift shaft
will turn but jack shaft does not turn.
4. Leg locked and will not turn.
5. Right-hand leg will not stay fully shifted in
low gear.
6. Noisy gearbox.
XL-LG330-01 Rev. B
SOLUTION
Bolts must be loose and cross driveshaft free to
move in slots provided.
Remove cross driveshaft bolt and crank each leg
on the jack shaft.
(See Lubrication Instructions).
Legs must be timed together, parallel to each other
and perpendicular to the trailer crossmembers.
Replace damaged part.
Disassemble and inspect for wear. If screw and/or
nut show considerable wear, then replace entire
retracting tube assembly.
Minimum end play 1/32˝.
Replace damaged gears.
Check to see if trailer mounting bracket has
sufficient size clearance hole to miss landing gear
boss or shift shaft.
Replace entire retracting tube assembly.
Replace.
Replace.
Replace.
Grind weld as required and re-weld.
Press boss back into position.
Broken cross driveshaft bolt or damaged cross
driveshaft. Replace damaged part.
Damaged pinion or bevel gear. Replace damaged part.
Damaged input, idler, and/or output gear. Replace
damaged part.
Bent retracting screw or damaged riser nut and
screw. Replace entire retracting tube assembly.
Shift lock ball and shift lock spring missing or
damaged shift lock spring. Replace missing or
damaged part.
Check that shift shaft movement is 1˝ when shifted
between gears.
3
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