Section Contents
2.1
BEST BY FARR
TM
14 1/2" Closed Mouth Trailer-Mounted Bucking Unit
Technical Manual
The Farr Hydraulic Power Tong has been designed such that assembly is simple and can be accomplished without the
use of special tools. The following sequence is presented as a guide only for the technician performing assembly as
it would take place in our plant. Much emphasis has been placed on disassembly and reassembly in the maintenance
and overhaul section of this manual. Therefore, use this assembly section only to aid in familiarization of parts and
their locations, and use the overhaul and maintenance section as a specific guide to assembly.
ASSEMBLY SEQUENCE
1. Position the tong body gear case on a suitable stationary support such that the bottom body plate is
accessible.
2. Install bottom pinion bearing and bearing cap.
3. Install bottom clutch bearing and bearing cap.
4. Install rotary roller shafts, rollers, bearings and spacers.
5. Install rotary drive gear. (Limit grooves should be face side up).
6. Install rotary idler gears, bearings, shafts and spacers, making sure microgrooves in gear are in
upright and proper position. (Micro-groove gear should be located on the gear shift lever side of tong).
7. Install bottom pinion gear (shoulder side down).
8. Install pinion gear shaft into the spline of the bottom pinion gear.
9. Install clutch shaft, needle bearings, bottom clutch gear.
10. Install pinion idler gears, bearings and half shafts.
11. Install shifting collar which will slip over clutch shaft and mesh with low or high clutch gear.
12. Position the shifting shaft (with shifting yoke attached) on the shifting collar.
13. Install top pinion gear (shoulder side up).
14. Install top clutch gear.
15. Position the top plate in its proper location and insert dowel pins.
16. Align mounting holes of pinion idler half shafts with top plate, and install (half moon) pads and bolts.
17. Install top clutch bearing, retainer and bushing.
18. Install clutch drive gear and retainer.
19. Install motor mount.
20. Install shifting cylinder.
21. Install rotary idler pads and nuts, pinion idler shaft nuts, roller shaft nuts, and then secure
the top plate in place with bolts around perimeter of tong.
22. Install top pinion bearing and bearing cap.
23. Install motor and valve assembly.
Tong Assembly
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