4-2. R O. PUMP ASSEMBLY POWER END MAINTENANCE - continued
Dry cleaning solvent PD-680 is highly toxic and can ignite organic materials, nitrates, carbides
and chlorates. Wear eye, skin and respiratory protection. Use in well-ventilated area.
Clean all components with cleaning solvent and rags.
a. Power Frame (13). Inspect frame for cracks, stripped threads and scratched or scored bearing surfaces,
particularly in the crosshead bores, and excessive wear. If threads are stripped or power frame is cracked, badly
scratched or scored, or if difference between inside diameter of bore and outside diameter of crosshead (with
known good crosshead) exceeds 0.009 in, power frame should be replaced.
b. Crossheads (23). Check crossheads for wear, scratches and stripped threads. If crosshead is severely
scratched, threads are stripped or, if difference between inside diameter of crosshead bore and outside diameter
of crosshead exceeds 0.009 in, crosshead should be replaced
c. Connecting Rods (27). Check rods for cracks, deformation and excessive wear. Replace if unserviceable.
d. Crankshaft (31) and Connecting Rod Bearings (24). Check for worn journals and damaged/ worn bearings. If
journals are rough, crankshaft should be replaced. If bearings are rough and /or if difference between internal
diameter of bearings (bearings assembled on connecting rod, but without crankshaft) and outside diameter of
corresponding crank shaft journal, exceeds 0.005 in, bearings should be replaced.
e. Plungers (8). Check for cracked or chipped ceramic material on sides of plunger and for worn/damaged
connecting nut and retaining ring. Replace plunger if ceramic material is chipped or cracked. If connecting nut
or retaining ring are damaged, replace them.
f. Miscellaneous Hardware. Check all remaining hardware for cracks, damaged threads, excessive wear,
corrosion, deformation and other damage, making the item unserviceable. Replace unserviceable hardware.
Repair of pump assembly at the power end shall consist of replacement of defective components. No attempt
should be made to repair components by sanding, welding, honing or machining.
a. Place power frame on a clean work bench.
b. Connect crossheads (23) to connecting rods (27), using pins (22)