Start-Up Procedure - Eaton 70523 Parts And Repair Information

Model 70523

Start-up Procedure

When initially starting a rebuilt load sensing system,
it is extremely important that the start-up procedure
be followed. It prevents the chance of damaging the
pump which might occur if the system was not
properly purged with oil before start-up.
1 After the pump has been properly installed onto
the machine and all hydraulic connections have been
made, check all fittings to make sure that they are
tight.
2 Fill the pump housing at least 1/2 full with
system oil that has been filtered through a 10 micron
filter.
3 Fill the reservoir with an approved oil that has
been filtered through a 10 micron filter. Leave the
filler cap loose as a means of air that is trapped in the
system.
4 Note on gasoline or L.P. engines: remove the coil
wire and turn the engine over for 15 seconds. Diesel
engines: shut off the fuel flow to the injectors and
turn the engine over for 15 seconds. This procedure
enables the pump to pick-up the oil before start-up.
At this time disconnect the sensor line from the
pump compensator and pull one of the valve spools
while the engine is being turned over. This allows oil
to flow through the sensor line, thus, removing any
air in the sensor line. Reconnect the sensor line after
a steady flow of oil is coming from the line.
5 Replace the coil wire or return the fuel flow to the
injectors and start the engine. Run at low idle speed
for one minute. The pump should immediately pick
up oil and go into low pressure standby. If there is no
indication of fill in 30 seconds, stop engine and
determine the cause.
6 After the pump has stabilized in low pressure
standby, operate the control valve and steering, if the
system is equipped with one, to purge the system of
air and to fill the cylinders with oil. Continue
operating the system slowly with no load until it
responds fully.
7 Check fluid level at the reservoir and refill if
necessary to the proper level at the reservoir and
refill if necessary to the proper level with an
approved filtered oil.
8 Check all line connections for leaks tighten if
necessary.
9 The machine is now ready to be put into
operation.
10 Short hour filter changes are recommended for
the first two changes after placing the machine back
into operation. The first filter would be changed in 3-
5 hours and the second at approximately 50 hours.
Routine scheduled filter changes are recommended
for maximum life of hydraulic system.
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