14
G25-991-2400A
H/G-25 Service (Fluid End)
5B. Priming the Hydraulic Cells
for Kel-Cell Pumps (Cont’d)
Method #1 (system head pressure less than 2
psi)
a. Install the valve plate (16) but without the outlet valves
installed (or else remove the outlet valves; leave the
seats installed) onto the cylinder housing. Tighten the
two socket-head screws (41).
b. Fill the reservoir with appropriate Hydra-oil to the fill
port.
c. With a blunt pointer (eraser end of pencil), reach in
through each outlet valve port and push the follower-
diaphragm backwards. Note the air bubbles coming out
at the oil fill port. Now turn the shaft about 1/2 turn.
d. Repeat depressing diaphragms and rotating shaft
(approx. 4-6 times) until no more air bubbles escape and
the oil has dropped about 1 inch (25 mm) from the top of
the fill port. The hydraulic cells are now primed. Replace
the oil fill cap.
e. Install outlet valve assemblies in each outlet valve port.
See Parts Manual for correct assembly order. You may
have to tip pump (head upward) in order to keep the valve
centered on the seat and allow the retainer to fit all the
way into port flush.
f. Install manifold (6) and complete installation.
Alternative Method #1:
With the pump horizontal, and the fluid-end head removed, fill
the reservoir with the appropriate Hydra-oil for the application.
Have a catch basin for oil that leaks from behind the diaphragms
when priming. Catch the oil and dispose of it properly; do not
reuse it.
a. All air in the oil within the hydraulic piston behind the
diaphragms must be forced out by turning the shaft (and
thus pumping the piston). A shaft rotator is included in the
Hydra-Cell Tool Kit. Keep pressure on the diaphragms
while turning the shaft until a bubble-free flow of oil comes
from behind all the diaphragms. Maintain the oil level in
the reservoir. Do not allow oil level to be lower than the
reservoir.
b. Quickly attach the loaded valve plate (16) (before the oil
runs out past the diaphragms) with socket head screws
(41), but do not tighten completely. Leave a gap between
the valve plate and the cylinder housing. Turn the shaft
2-3 turns to finish forcing out air behind the diaphragms.
The hydraulic cells are now primed. Now finish tightening
the valve plate with the two socket head screws and add
pump manifold.
c. Wipe excess oil from around the pump head.
d. Check that the oil level is 1 inch (25 mm) from the top of
the fill port.
e. Replace the oil fill cap and complete installation.
Method #2 (head pressure greater than 2 psi)
This simple and clean method of priming the Hydra-cells
requires an inlet head pressure of at least 5 feet (1.5 m) or 2 psi
(.14 bar). The pressure source is required to hold the diaphragms
back while the piston moves so as to force out the air.
Completely assemble the pump and fill the reservoir with the
appropriate Hydra-oil to the fill port.
a.
When tank head pressure is being used to prime,
install the pump back into the system and connect the
tank supply line to pump inlet. Pump discharge line may
be connected at this time, but end of line must be open
to allow air to pass out.
b. Slowly turn the pump shaft by hand and watch for
bubbles exiting the oil reservoir fill opening. This will
take several rotations; when no more bubbles come out
and the reservoir level has dropped about 1” (25 mm),
the hydraulic cells are primed.
c. Replace the oil fill cap and complete installation.
d.
When compressed air is being used to prime, insert
a clean air hose to the pump inlet and restrict the pump
outlet. Turn the shaft a quarter turn and then apply
air pressure into the manifold to put pressure on the
diaphragms. This will force air out from inside the pistons
and you will see bubbles at the reservoir opening. Repeat
for several rotations until no more air bubbles come out
and the reservoir level has dropped about 1” (25 mm).
The hydraulic cells are now primed.
e. Replace the oil fill cap and complete installation.
6. Reinstall Valve Plate (18),
Manifold (7)
a. Reinstall the valve plate (18), with the valve assemblies
installed as outlined above, onto the cylinder casting.
b. Reinstall the O-rings between the valve plate and
manifold. (See illustrations to determine which O-rings
to use depending on pumping head material.) Use
petroleum jelly or lubricating gel to hold them in place.
c. Reinstall the manifold onto the valve plate. Be sure the
drain plug (4) is at the bottom of the manifold. If the
pumping head is non-metallic, support plate (43) is also
required.
d. Insert all bolts (5), washers (6), and nuts (31) around the
edge of the manifold, and the centerbolt (1) with washer
(2). Hand tighten.
e.
H-25 (external centerbolt models only). Install the
centerbolt (1), with its washer (2), and tighten it. Torque
to 60 N-m.
Model H-25
e. Torque centerbolt to 45 ft-lbs.
f. Alternately tighten opposite bolts (5) until all are secure.
Torque to 45 ft-lbs.
Model G-25
e. Alternately tighten opposite bolts (5) until all are secure.
Torque to 60 N-m.
f. Torque the centerbolt to 60 N-m.
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