L4383.
.
9
7.7 Pump Not Running Properly
It is not necessary to dismantle the Air Motor. Proceed
as follows. If for any reason the pump does not run
properly, look for one of the following causes.
1. If the pump appears to be short stroking and
running too fast without pumping properly, it
usually indicates that the Air Check Assembly is
not working as it should be. (See section 7.2 for
correction procedure). Refers to hydraulic check
value repairing or replacement.
2. Loss of pressure may be caused by one of two
reasons:-
i. the Hydraulic Check Valves have developed a
leaky condition or
ii. the hydraulic fluid is bleeding past the packing
in the Hydraulic Cylinder. (See section 7.3 to
7.5 for repair instructions). Refers to hydraulic
packing replacement.
3. Should the pump commence to run erratically and
in a jerky manner after a period of time, it is usually
an indication that a seizing action is taking place in
the Hydraulic Piston and Cylinder Assembly. (See
section 7.1 and 7.3 for disassembly instructions).
This is usually caused by foreign matter such as
alkali, dirt, grit or chemicals that do not have
sufficient lubrication qualities being present in the
fluid supply. If the Hydraulic Piston and Cylinder
have not been damaged, a thorough cleaning will
normally place the pump in operation again.
4. For maximum volume of flow, make sure that
a sufficient flow of air is supplied to the pump.
Hooking the pump up to a smaller pipe size than
the “AIR IN” port on the pump will not allow it to
run at its full rated capacity. Long runs of relatively
small pipe supplying air to the pump will have the
same effect.
5. If an excessive amount of oil or water is coming
through the pipe air exhaust, check the following:-
a. The Lubricating Unit in the air supply is
delivering too much oil. Adjust to about one
drop of oil for every 20 strokes of the pump.
b. The Filtering Unit in the air supply is not
functioning properly. The bowl should be
cleaned periodically to assure delivery of clean
air to the pump.
c. The Hydraulic Fluid being pumped (oil or water)
may be leaking past the packing in the Hydraulic
Cylinder into the Air Motor. (See section 7.3 for
correction procedure).
8.0 STORAGE AND SPARES
8.1 Reassembling the Pump
Hydraulic Harness and Fittings
1. Wipe all hoses clean and apply a light coating of oil
or suitable rust inhibitor to all nipples, couplings,
and tee blocks.
2. Always keep dust caps fitted to nipples and
couplings when hoses are not in use.
Air Driven Pump Unit
1. Always store the pump upright.
2. Apply light oil coating or suitable rust inhibitor to all
exposed un-plated metal items.
3. Leave the oil Return-To-Tank valve in the open
position.
4. Leave the air control valve in the open position.
5. Always keep dust covers on inlet/outlet hydraulic
fittings.
8.2 RECOMMENDED SPARES
Complete Seal Kit for Air Motor & Hydraulic Assembly:
D3001A0100SK
