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08
Repair Instructions
Manual 1843 Rev B p/n 001843 0000
ASSEMBLY
Thoroughly clean all parts and remove harmful
rough or sharp areas before assembling. Do
not use solvents such as kerosene or carbon
tetrachloride for cleaning unless facilities are
available to evaporate them by vapor degreasing
or by 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 the open head (with sleeve
bearing pressed in) using two dowel pins for
alignment and secure with three cap-screws.
This will support the shaft when assembling
the 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.
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 0.005 in. (0.127 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.-lb
(10 N-m), as damage to the cylinder may
result. Remove the two pieces of shim stock.
Lock screws in the removable wall should not
be reused.
7. Install slide-pin spacer.
8. 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.
9. Place the closed head slide pin on the piston
slide with the flat edge toward the piston. With
the inlet ports facing down, insert the piston
and pin into the cylinder.
10. Press the sleeve bearing into the closed head.
Apply a thin coat of Loctite 515, or equal
sealing compound, to the sealing surfaces of
the head and cylinder. Insert the two dowel
pins into the cylinder and install the closed
head. Tighten capscrews evenly.
Sealing compound must be used sparingly
to prevent squeezing it into the pump when
tightening heads. Allow compound to become
tacky before installing heads.
11. Remove open head.
12. Install slide-pin spacer.
13. Place the cam keys in the shaft grooves and
tap the outer cam onto the shaft with the
threaded holes of the cam outward.
14. Place the open head slide pin on the piston
slide with the flat edge toward the piston, and
insert the piston and slide pin into the cylinder
with the inlet ports of the piston facing down.
15. Install the open head using the procedure for
installing the closed head.
16. Slip the backup ring on the shaft and install the
rotating part of the shaft seal.
