Powerex Medical Packing System MPQ - Manual (Page 17)

10
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