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1. Disconnect all manifolding, water lines, and electrical connections and drain the oil.
2. Remove the belt guard and belts.
3. Remove the oil lines from both ends.
4. Remove the sheave from the motor and the motor from the top of the pump.
5. Remove the pump sheave and drive key.
6. Remove the oil sight gauge from the separator cover. Remove the separator cover from the separator.
7. Unscrew the air/oil separator assembly. Remove the valve cover from the cylinder.
8. Remove the discharge valves. If valves are disassembled, careful note should be made for proper reassembly.
9. Remove the separator housing and gasket from the cylinder.
CAUTION: The separator housing has threaded holes to receive eye bolts for lifting the pump. When the
separator housing is removed, do not attempt to lift the pump cylinder by using the gas ballast or oil drain
piping to attach or support rigging for hoisting the cylinder.
10. Remove the bearing, housing and stationary parts of the shaft seal.
11. Unscrew the retainer nut from the shaft.
12. Remove the cap screws from the housing.
13. Remove the rotating part of the shaft seal.
14. Remove the oil pump and housing from the closed head. Remove the closed head using two securing bolts as jackscrews to
break the seal between head and cylinder after all securing screws are removed. Press the sleeve bearing from the head.
15. Withdraw the slide-pin, piston and cam.
16. Remove the retaining ring from the shaft. Loosen the socket head self-locking screws in the removable wall to release the
pins securing the wall to the cylinder. Remove the wall, being careful not to cock it as it is removed.
17. Withdraw the piston, slide-pin and piston.
18. Remove the open head following the same procedure as removing the closed head and press the bearing from the head.
19. Withdraw the piston, slide-pin and cam.
20. The shaft and center cam can be taken out the closed head end of the pump. Press the center cam from the shaft.
REASSEMBLY
Thoroughly clean all parts and remove harmful rough or sharp areas before reassembling. Do not use solvents such as kerosene
or carbon tetrachloride for cleaning unless facilities are available to evaporate them by vapor degreasing or washing with acetone
or alcohol. When reassembling, all parts must be coated with vacuum oil.
1. Place keys in the shaft grooves and press center cam on shaft until it Is against the shaft shoulder. It may be desirable to heat
the cam in vacuum oil to approximately 300°F (150°C) for easier assembly.
2. Temporarily mount open head (with sleeve bearing pressed in) using two dowel pins for alignment and secure with three
capscrews. This will support shaft when assembling closed head end of pump.
3. From the closed head side, move the shaft through the hole in the stationary wall until the center cam is against the wall.
4. Place the slide-pin over the slide on the center piston with the flat edges of the slide-pin toward the piston and with the cap
end to the left when facing the inlet ports.
5. With the piston port facing downward, insert the piston and slide-pin into the cylinder.
CAUTION: If the inlet ports on the piston face the wrong way the piston can not pump.
6. Carefully clean the removable wall seating shoulder. Insert the beveled ends of the dowel pins into the outside edge of the
floating wall. If necessary, use vacuum grease to hold the pins in the holes. Slide the removable wall into the cylinder from the
closed head side with the crescent shaped cutout in the wall oriented to fit around the slide-pin. Place two pieces of .005 inch
(.127 mm) shim stock at the ends of the cutout between the slide-pin and removable wall. Screw new lock screws into the
removable wall and with the wall firmly against the cylinder shoulder, tighten the socket head set screws to drive the dowel
pins out against the cylinder to secure the wall in place. When tightening the center wall set screws, do not exceed a torque
of 90 in-lbs as damage to the cylinder may result. Remove the two pieces of shim stock.
CAUTION: Lock screws in the removable wall should not be reused.
7. Place the retaining ring on the shaft. Insert the cam keys in the shaft grooves and tap the outer cam onto the shaft with the
threaded holes of the cam outward.