Powerex Medical Packing System MPQ User Manual download pdf (Page 14)

Oilless Reciprocating Air Compressor Pumps

1. Remove cylinder head and cylinder.

2. Do not use tool to remove the ring.

NOTE: Expanding ring too much and deforming can cause wear and leakage.

(See Figure 12). Mark upper surface (not lower surface) of removed ring for

easy distinction.

3. Inspect lower surface (A) and outer side surface (B) of ring (See Figure 13).

Measure thickness (C) of ring with calipers. Replace if foreign matter enters

(A, B) or deep damage is found or (C) dimension is less than 2.5 mm at any

point around the rings circumference.

NOTE: Clean the whole ring and ring groove with soft clean cloth.

Ring and piston dust build up in the ring groove can

cause knocking. This is sometimes mistaken for bad valve

or bearing.

REASSEMBLE: Pay attention to the fit of the piston and wrist pin fit. There

should be no axial play or looseness in the wrist pin area.

NOTE: Do not separate piston from connecting rod when inspecting piston

or ring. If you remove piston from connecting rod, you may damage oil seal

of connecting rod and needle bearing.

PISTON REPLACEMENT

1. Inspect for appearance if there is deep damage or crack on top of piston or

at pin boss.

2. Remove piston ring and inspect for breakage or droop of ring land.

3. Remove o-rings on both sides of piston pin.

4. Push piston pin to one side.

NOTE: Install bearing retention sleeve in grease kit/piston set. The retention

sleeve is to prevent the needle bearing from falling out of the bearing area.

On the HP cylinder only.

5. Remove piston pin.

CAUTION

INSPECT PISTON AND PISTON RING (INSPECT EVERY 5,000 HOURS)

(B)

(A)

Figure 11

Figure 12

Figure 13

(C)

Figure 14

O-ring

Piston pinPiston

Piston rings

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 26 27

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Powerex Medical Packing System MPQ User Manual Page 14