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Oilless Reciprocating Air Compressor Pumps

Inspect Connecting Rod, Wrist Pin and Crankshaft

REPLACE CONNECTING ROD SET AND CRANKSHAFT AS A SET

Pressing bearing into connecting rod and connecting rod set into crankshaft

requires special fixtures. Without such fixtures, the squareness and paral-

lelism of each part will be affected.

DISASSEMBLE AND REMOVE CYLINDER COVER, CYLINDER AND PISTON

IN THIS ORDER

1. Bearing at large end of connecting rod: Replace if it does not move or

feels stuck holding and moving small end of connecting rod.

2. Bearing of crankshaft: Replace if you feel some resistance when slowly

turning shaft.

3. Bearing at wrist pin: Check for breakage of needle bearing and damage of

cage.

DISASSEMBLING: CRANKSHAFT SET

1. Disassemble cylinder head, cylinder and piston.

2. Remove bolts from bearing cap and remove bearing cap.

3. Lightly tap shaft fan side with non-shock hammer (avoid metal hammer)

and remove crankshaft. After bearing leaves the crankcase bore, pull con-

necting rod out as illustrated and remove it from crankcase (See Figure 23).

REASSEMBLY

1. Heat bearing housing of crankcase with industrial dryer or simple burner

just the same as disassembling.

2. Insert crankshaft set into crankcase in reverse order of disassembling and

insert bearing into housing.

3. Tap shaft from pulley side with non-shock hammer and insert it inwards.

4. Fit bearing case. Grease bearing housing of bearing case.

Shaft

fan side

Figure 23

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Powerex Medical Packing System MPQ User Manual Page 17