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Section 5
REDUCTION GEAR TROUBLESHOOTING
This section provides basic troubleshooting information. Specific causes to problems are best identified by thorough inspections
performed by personnel instructed in safety, operation and maintenance of this equipment. The chart below provides a brief guide to
common reduction gear symptoms, probable causes and remedies.
REDUCTION GEAR - GENERAL INFORMATION
Description
The reduction assembly is a planetary gear type design. There
are two planetary stages used in this reduction gear to achieve a
43:1 reduction. The air motor provides input to the first stage
sun gear which turns the planet gears. The first stage planet
gears are connected to the planet carrier which is connected to
the sun gear of the second stage. The sun gear in the second
stage drives the planet gears, in the second stage, which are
connected to the planet carrier. The planet carrier in the second
stage is connected to the outboard upright through the output
shaft. This prevents planet carrier rotation. Rotation of the
second stage planet gears causes the reduction gearbox housing
to rotate. The housing is connected to the drum by the cover and
capscrews.
Operation
Depending on which direction (clockwise or counterclockwise)
the input shaft is turning will determine the direction of drum
rotation. The speed of drum rotation is dependent on the speed
of the input shaft. This allows the operator to vary the drum
speed by controlling air motor speed. Planetary gears are not
inherently self locking (as are some other types of gearing) it is
therefore important that the braking systems work properly.
Symptom
Cause
Remedy
Grinding noise or excessive vibration when
rotating.
Worn bearings or thrust washers.
Disassemble, inspect and repair.
No drum rotation
Broken gear teeth.
Disassemble, inspect and repair.
Summary of Contents for FA5A
Page 10: ...10 DISC BRAKE PARTS DRAWING Dwg MHP0667 Dwg MHP0630 One Way Clutch Detail Section 1...
Page 19: ...19 Section 2 SERVICE NOTES...
Page 54: ...54 REDUCTION GEAR ASSEMBLY PARTS DRAWING Dwg MHP1221 Section 5...
Page 57: ...57 SERVICE NOTES...
Page 58: ...58 SERVICE NOTES...
Page 59: ...59 SERVICE NOTES...