Manual 1808 Rev B p/n 001808 0000
17
DISASSEMBLY
Disassemble the pump only to the extent
necessary to repair it. Reference is made to the
open and closed head ends of the pump. The
open head is on the end through which the shaft
extends.
1. Drain the oil by opening the oil drain valves.
Remove the belt guards and belts.
2. Disconnect the piping and electrical
connections to the oil solenoid.
3. Remove the pulley and drive key.
4. Remove the gas ballast valve and oil lines.
5. Remove the oil separator tank.
6. Remove the pump from base and position it on
a workbench.
7. Remove the cylinder cover, gasket, and
discharge valves.
8. Unlock the bearing from the shaft by removing
the locking nut. Lift the dowel pin from the shaft
and tap the tapered sleeve axially to break
the bond between the sleeve and the bearing.
Remove the bearing housing, rotating part of
the shaft seal, and the retaining ring from the
shaft.
9. Unscrew the cap screws and remove the open
head, piston, and slide pin. Mark the slide pin
and piston so as to reassemble as before.
10. Remove the closed head, piston, slide pin, and
cam. Remove the cam by tapping the shaft
with a soft-faced hammer until the cam is free
from the shaft. Disassemble only if cam and
shaft replacement is necessary.
11. A press is necessary to remove the open head
cam from the shaft.
12. Slip off the coil from the stem. Inspect the
solenoid valve seat, plunger, and spring.
REASSEMBLY
Before starting to reassemble the pump, inspect
all parts for wear or damage, and replace as
necessary. Parts must be clean and free of old
sealing compound. A recommended solvent for
cleaning the parts is trichloroethylene. Other
solvents such as kerosene or carbon tetrachloride
can be used only if facilities are available to vapor
degrease the parts after cleaning. Dry the parts
and coat them with vacuum oil to aid in assembling
and provide lubrication on initial start-up.
The reassembly steps are as follows:
1. Replace the bearings in the pump heads.
2. Replace the cam key and press the open head
cam onto the shaft. Carefully slide the shaft
through the center wall. Install the open head
with two screws to position the shaft.
3. Insert the cam key and tap the closed head
cam onto the shaft snug against the shaft
shoulder.
08
DISASSEMBLY / ASSEMBLY
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