Product Manual

52 Owner’s Manual for Dry-Prime Diesel Trash Pumps
Maintenance
5. Install the impeller. Verify that the spring slides over
the impeller hub and pushes against the
backshroud of the impeller.
Priming Chamber
Float Removal
1. Loosen the hose clamp and disconnect the air
hose from the prime valve.
2. Remove the four 3/8 in. hex nuts and capscrews
from the priming chamber cover.
3. Lift off the priming chamber cover, complete with
float linkage and prime valve assemblies.
4. Unscrew the float from the rod set screw.
Installation
1. Screw the float onto the rod and lock with set
screw.
2. Install the priming chamber cover, complete with
float linkage and prime valve assemblies.
3. Install the four 3/8 in. hex nuts and capscrews and
tighten against the gasket.
4. Reconnect the air hose and secure with a hose
clamp.
Prime Valve Removal and Installation
1. Remove the priming chamber cover, complete with
float linkage and prime valve assembly. Refer to
Float Valve Linkage Removal and Installation.
2. The valve body can be separated from the priming
chamber cover by removing the 3/8 in. capscrews
for access to the O-ring. No other parts are directly
accessible from outside of the cover.
Float Valve Linkage Removal and Installation
There is normally no reason to remove or replace the float
valve linkage unless parts have experience damage. In the
event that replacement is required, use the following
instructions:
1. Separate the linkage frame from the cover by
removing the two 5/16 in. capscrews. There may
also be stainless flat washers between the frame
and cover. (It is important to replace these washers
when replacing the frame, as the total mounting
distance between the top of the cover and the
frame is an essential element in proper priming
valve operation.)
2. All elements of the linkage are held in position with
clevis pins, side links and cotter pins. To remove
any damaged element, straighten and remove the
necessary cotter pins and clevis pins.
NOTE: The tow actuator arms are very similar in appear-
ance. Before removing either of these parts, make spe-
cial note of their position and direction in relationship to
other assembly parts.
3. The valve stem assembly may be removed by a
similar action of pin removal. Two cross-drilled
holes in the lower end of this part, with slightly
separated center lines, accommodate accumulated
tolerances in the assembled linkage parts. In most
instances the drill from which the clevis pin has
been removed will be the one to re-use on
reassembly.
Linkage Replacement
1. Reverse the previous procedure steps.
2. When the linkage is correctly assembled and
fastened to the cover, the valve seat O-ring should
seat firmly when the float ball is raised to its
uppermost position, and a 1/8 in. (3 mm) minimum
gap should remain between the two actuator arms.
If the arms can come together, the valve may not
be adequately seating.
Strainer/Baffle
At factory assembly, the strainer is pushed onto the
bottom of the priming chamber and is held in place by
friction. During normal operation this strainer can drop
loose from the cone and rest on the slotted suction spool
pipe. This is NOT a problem. Air being evacuated from
the suction piping can travel freely through the slots and
around the strainer.
Separator
There is no regular maintenance to be performed on the
separator. However, there are precautions for operation
during freezing conditions. In freezing conditions, verify
that there is no ice in the separator chamber to impede the
separator float movement. Warm water can be poured over
the separator or into the separator chamber through the
separator hose connection. When pumping in extremely
cold conditions, ice may form on the separator valve seat,
preventing closure and allowing water into the compressor.
Close observation must be maintained and the pump shut
down at the first signs of water coming from the
compressor.
NOTE: During an initial re-prime, there may be liquid
remaining in the suction spool above the slots. This may
allow brief misting out the discharge before the prime
valve has closed. If at any other time during operation
pumpage is seen continuously exhausting from the com-
pressor, the pump should immediately be shut down and
the priming chamber cover should be removed. Inspect
the float assembly for any impediment to its movement. It
should be able to fully close the valve stem assembly to