Bulletin 947023
THE OILGEAR COMPANY
11
TESTING AND ADJUSTING
Shut the pump OFF and release pressure
from the system before disassembling
components. Failure to comply with these
instructions could result in personal injury
or death. Blocking the pressure line
between the pump and the system (or
pump) high pressure relief valve will result
in damage and could result in serious
personal injury.
PISTON PUMP
To check for a worn piston pump, make a leak
measurement test from the case drain while the
pump is under pressure. After the unit is warm,
either install a flow meter in the drain line or have
the flow from the drain line directed into a large
container or reservoir. The pump case must remain
full of fluid during this test.
DO NOT run a pump on stroke against a
blocked output unless it is protected by a
high pressure relief valve and then run no
longer than necessary to check slip. Limit
discharge to prevent dropping reservoir
fluid below low level.
With an accurate high pressure gauge in the
pressure line, start the pump and stall (or block)
output device to raise system pressure to
maximum (as set by system relief valve). Read the
measurement on the flow meter or time and
measure the case drain flow to fill a known size
container and calculate the flow rate.
Additional leakage indicates wear, but
does not become critical until it impairs
performance.
DISASSEMBLY
The cleanliness of working on this pump or
the hydraulic system is extremely important
to the safety and reliability of the pump and
the system.
When disassembling or assembling the
pump, choose a clean, dry and dust- and
sand-free area where no traces of abrasive
particles are in the air which can damage
the pump and system. DO NOT work near
welding, sandblasting, grinding benches or
similar conditions.
Always make sure the fittings are clean on
the outside before removing them from
their connections. Make sure they are
capped and plugged when removed. Place
them on a clean surface and in a clean rag
or container until they are reinstalled.
When cleaning parts which have been
disassembled, it is important to use
CLEAN cleaning solvents and parts are
allowed to dry. All tools and gauges should
be clean prior to working with the system
and use new, CLEAN lint-free rags to
handle and dry parts.
DO NOT attempt to remove or install any
components or assembly while the pump
and system is running. Always stop the
pump, shut OFF the power and release
pressure from the system before servicing
or testing. Be sure provisions have been
made so the case drain line can be
disconnected from the unit without
causing the line to drain (siphon) the
reservoir.
!
WARNING
CAUTION
NOTE
NOTE
!
WARNING
