Pumps and Motors

TB 43-0142

determination made as to whether further use of the component would constitute an undue hazard.

Conditions such as the following should be sufficient reason for replacement:

(a) Any evidence of hydraulic oil leakage at the surface of the flexible hose or its

junction with the metal end couplings.

(b) Any blistering or abnormal deformation to the outer covering of the hydraulic hose.

(c) Hydraulic oil leakage at any threaded or clamped joint that cannot be eliminated by

normal tightening or recommended procedures.

(d) Evidence of excessive abrasion or scrubbing on the outer surface of a hose, rigid

tube, or hydraulic fitting. Means should be taken immediately to eliminate the interference of the

elements in contact or otherwise protect the components.

(2)

Pumps and Motors. The following may be reason for replacement or repair:

(a) Loose bolts or fasteners.

(b) Leaks at joints between sections.

(c) Shaft seal leaks.

(d) Unusual noises or vibration.

(e) Loss of operating speed.

(f) Excessive heating of the hydraulic oil.

(3)

Valves. The following may be reason for replacement or repair:

(a) Cracks in valve housing.

(b) Improper return of spool to neutral position.

(c) Leaks at spools or joints.

(d) Sticking spools.

(e) Failure of relief valves to attain correct pressure setting.

(4)

Cylinders. The following may be reason for replacement or repair:

(a) Drifting caused by oil leaking across piston.

(b) Rod seals leaking.

(c) Leaks at welded joints.

(d) Scored, nicked, or dented cylinder rods.

(e) Dented case (barrel).

(f) Loose or deformed rod eyes or connecting joints.

(5) Filters. Evidence of rubber particles on the fitter element may indicate hose, O-ring,

or other rubber component deterioration- Metal chips or pieces on the filter may denote failure in

pumps, motors, or cylinders. Further checking will be necessary to determine origin of the problem

before corrective action can be taken.

e. Wire Ropers. A thorough documented inspection of all ropes shall be made. Presence of

any of the following shall be cause for removal from service:

(1) Broken outside wires. Those sections of the rope subjected to reverse bends and

operation over small diameter drums or sheaves should be given particularly close attention; refer to

Appendix C, paragraph C-2-a.(1) for criteria.

A-5