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Servicing the Fluid Section
1. Remove the screw that secures the pressure control knob.
Remove the knob.
2. Loosen and remove the three front cover screws. Remove the
front cover.
3. Rotate the pump shaft so the piston is in the bottom dead
center position. This can be done by moving the yoke. This is
required to disassemble all the parts.
4. For Upright Cart units, remove the return hose from the hose
clip on the siphon tube. Unscrew the siphon tube from the
inlet valve housing.
5. For Stand units, remove the retaining ring from the bottom
of the inlet valve housing by squeezing the tabs together.
Remove the suction set assembly.
6. Loosen and remove the high-pressure hose from the outlet
fitting on pump manifold.
Servicing the Valves
The design of the fluid section allows access to the foot valve
and seat as well as the outlet valve and seat without completely
disassembling the fluid section. It is possible that the valves may not
seat properly because of debris stuck in the foot valve seat or outlet
valve seat. Use the following instructions to clean the valves and
replace the seats.
Servicing the Inlet Valve
1. Using a wrench, loosen and remove
the inlet valve housing (1) from the
pump housing (2).
2. Remove the piston bushing (7),
cage (6), seal (5), ball (4) and inlet
valve seat (3).
3. Remove the O-ring (8) from inside
the inlet valve housing.
4. Clean out any debris in the inlet
valve housing (1) and examine the
valve housing and seat (3). If the
seat is damaged, replace the seat
and ball.
NOTE: when replacing the seat,
make sure the notched
side of the seat is facing
down when reinstalled
into the inlet valve
assembly.
5. Reinstall all parts back into the inlet
valve housing. The valve seat kit
includes a new O-ring (8), seat (3)
ball (4) and seal (5).
NOTE: The inlet valve assembly will be reinstalled onto the
pump block during "repacking the Fluid Section".
Servicing the Outlet Valve
NOTE: always service the outlet valve with the piston rod
attached to the pump. This will prevent the piston
rod from rotating during disassembly of the outlet
valve.
1. Using a 5/16" hex wrench, loosen and
remove the outlet valve retainer (9)
from the piston rod (10).
2. Clean out any debris and examine
the outlet valve retainer (9) and seat
(11). If the seat is damaged, replace
the seat. The radius edge of the seat
should contact the ball.
3. Remove, clean, and inspect the outlet
cage (13) and outlet valve ball (12) .
Replace if they are worn or damaged.
NOTE: During reassembly of the
outlet valve, apply one drop
of Loctite (included in the
repacking kit) to the threads
of the outlet valve retainer
before threading it into the
piston rod. Then, torque the
retainer to 168-180 in.-lbs.
(14-15 ft.-lbs.).
4. Reassemble the valve by reversing the steps above. Make
sure the outlet valve retainer (9) is reinstalled with the non-
threaded "lip" facing up into the piston. The valve seat kit
includes a new outlet valve seat (11), outlet valve ball (12), and
outlet valve cage (13).
13
2
7
6
5
4
3
8
1
10
13
12
11
9
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