5
6
7
8
9
Crosshead
assembly
4
10
3
2
1
Appendix E—Parts Details for 491 and F491 Piston Assembly
Piston—Bill of Materials
Piston Diameter 4" (10.16 cm)
Ref
No.
Part No. Description Qty.
1.
7002-025TP125A Screw (socket head) 16
7207-025A Lock washer 16
2. 1985 Head (iron) 2
3. 1776 Ring expander 6
4. 1773 Piston ring 6
5. 1482 Locknut 2
6. 1483 Lock pin 2
7. 1986 Piston platform 2
8.
1528 Shim washer (thick)
As
Req.
1528 -1 Shim washer (thin)
9. 1527 Thrust washer 2
Ref
No.
Assembly
Number
Assembly Name Qty.
10. 1985-X Piston assembly 2
Piston Clearance (Cold)
a
Model Minimum Maximum
491
b
0.020" (0.51 mm) 0.044" (1.12 mm)
a
The distance from the bottom of the head to the top of the piston.
b
For 491 compressor with head O-rings.
WARNING
CAUTION: Always relieve pressure in the unit before attempting
any repairs.
76
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