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TM 5-2420-222-34
16-2
HYDRAULIC EARTH DRILL BORING HEAD MOTOR REPAIR (Con’t).
b.
CLEANING AND INSPECTION
WARNING
Dry cleaning solvent, P-D-680, is toxic and flammable. Always wear protective
goggles and gloves, and use only In a well-ventilated area. Avoid contact with
skin, eyes, and clothes, and DO NOT breathe vapors. DO NOT use near open flame
or excessive heat. The solvent's flash point Is 100°F-138°F (38°C-59°C). If you
become dizzy while using cleaning solvent, Immediately get fresh air and medical
help. If solvent contacts eyes, Immediately wash your eyes and get medical aid.
1.
Clean all metal parts with dry cleaning solvent. Dry thoroughly with clean, dry rags.
2.
Inspect metal parts for cracks, breaks, or bends.
3.
Inspect all threaded parts for damaged or stripped threads.
c.
REPAIR
Restore damaged threads using screw threading set.
d.
ASSEMBLY
NOTE
Perform steps 1 through 3 only if roller bearings and shaft bearings were removed.
1.
Using hammer and brass drift, install two bearing races (24), cones (25), and spacer (26) on shaft (13).
2.
Install spacer (23) and retaining ring (22) on shaft (13).
3.
Using hammer and brass drift, install two roller bearings (19 and 20) in rear housing (14).
4.
Position rear housing (14) in vise. Install two check valves (15) in rear housing.
5.
Install spacer (21) in rear housing (14).
6.
Tap shaft (13) assembly in rear housing (14).
7.
Install collar (12) on shaft (13) assembly and rear housing (14). Stake collar in place.
8.
Remove rear housing (14) from vise.
9.
Install new preformed packing (18) in center housing (1).
10.
Install spacer (17) and six keys (16) on center housing (1).
11.
Install center housing (1) and assembled parts on rear housing (14).
16-9
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