SM08-015-1
Page 17/(18 Blank)
LUBRICATION AND OIL RECOMMENDATIONS
All parts, with the exception of the outboard bearing, are
system, the oil must be drained, the entire system
lubricated by the hydraulic oil in the circuit. Particular at-
flushed clean, and any filter screens thoroughly cleaned
tention must be paid to keep the oil in the circuit system
or replaced. New oil should be supplied for the entire
clean. Whenever there is a pump or motor failure, and
system. Refer to the Lubrication Section in the Service
there is reason to feel that metal particles may be in the
Manual for the recommended oil.
RECOMMENDED START-UP PROCEDURE FOR NEW OR REBUILT PUMP
Before installing a new or rebuilt pump, back off the main
load and at low rpm (400 minimum). During this break-
relief valve until the spring tension on the adjusting
in period, the unit should run free and not develop an ex-
screw is relieved. This will avoid the possbility of imme-
cessive amount of heat. If the unit operates properly,
diate damage to the replacement unit in the event the
speed and pressure can then be increased to normal
relief setting had been increased beyond the recom-
operating settings.
mended operating pressure prior to removing the old
CAUTION
unit.
Always use an accurate gauge when
Before connecting any lines to the pump, fill all ports with
adjusting the relief valve pressure
clean oil to provide initial lubrication. This is particularly
setting.
important if the unit is located above the oil reservoir.
Reset the main relief valve to the proper setting while the
After connecting the lines and mounting the replace-
pump is running at maximum operating speed for the
ment unit, operate the pump at least two minutes at no
machine.
RECOMMENDED TEST PROCEDURE
Ensure there is an adequate supply of oil for the pump,
excessively hot, shut down immediately and locate the
at least one gallon of oil for each gpm of pump capacity.
problem source.
If one section of a tandem pump is being tested, ensure
Gradually increase pressure on the pump in 500 psi in-
all other sections not being tested are adequately sup-
crements until the desired test pressure has been
plied with oil. If any of the other sections run dry, or if
reached. This should take about 5 minutes.
plugs are left in ports, serious and permanent damage
will result.
Delivery should run close to rated performance figures
which are averaged from testing several pumps. A 5%
Feeding hot oil into a cold pump may cause the pump to
lower reading may be used as a rated minimum if new or
seize. Jog the pump by momentarily starting the driving
relatively new parts have been used. When rebuilding
engine or motor to gradually equalize the pump and oil
the pump with parts from the original pump, which, while
temperatures.
worn, appear satisfactory for use, a 10% or 15% lower
Run the pump at least two minutes at no load and mod-
reading may be permitted, depending upon the perform-
erate speed (not over 1500 rpm). If the pump becomes
ance expected from the equipment.
