5-9. TRANSFER PUMP UNIT REPAIR. (Refer to Figure 5-8)
This task covers:
Tool Kit, General Mechanics
Transfer pump unit removed from the
(Item 1, Section III, Appendix B)
Recovery / Recharger Unit; paragraph 5-8.1
Antiseize tape (item 3, Section II, Appendix F)
Remove 1/8 pipe plug (1) in upper end cap (2).
Install 0-160 psi pressure gauge where pipe plug was removed.
Apply air pressure to air drive by turning pump control valve handle on control panel clockwise to ON position.
Gauge will immediately rise from zero and stabilize at drive pressure for correct pilot valve operation.
Zero gauge reading indicates lower pilot valve (16) has not been actuated.
Full gauge reading indicates upper pilot valve (15) has not been actuated.
A slow rise in pressure indicates leakage in lower pilot valve or o-ring on inside end of spool (6) or o-ring on inside
end of sleeve (8)
A slow decrease in pressure indicates upper pilot valve (15) is faulty and repair is necessary.
Upon completion of test, turn pump control valve handle on control panel counterclockwise to OFF position and
disconnect air inlet line.
Upon completion of test remove gauge, wrap pipe plug (1) with one layer of antiseize tape (item 3, Section II,
Appendix F) and install in upper end cap (2).
5-9.2. Air Valve Repair. (Refer to Figure 5-8)
Unscrew muffler and pipe assembly (3) from elbow and retainer nut assembly (4).
Unscrew elbow and retainer nut assembly (4) from body (5).
Insert special tool P/N 28584 (item 4, Section III, Appendix B) into first row of holes in spool (6).