1000 HOURS:
HYDRAULIC RESERVOIR
Drain and clean the hydraulic reservoir. Change the hydraulic oil.
A change interval cannot be established which would apply to all oils and all operating
conditions of temperature and cleanliness. However, a reputable brand of turbine grade oil
can be expected to deliver 1000 hours of service under average operating conditions.
Although conditions may necessitate shorter change intervals, do not use hydraulic oil for
more than 1000 hours, unless oil analysis is used.
Whenever a visual inspection, chemical test or light test indicates that an oil change is
necessary, proceed as follows:
1. Warm the oil prior to draining but avoid draining immediately after prolonged
continuous use to reduce the danger of being burned by hot oil.
2. Retract all cylinders to return the maximum amount of oil to the reservoir. Loosen the
top covers and remove the drain plug at the bottom of the reservoir. Allow sufficient
time for the reservoir to drain thoroughly.
3. Remove the return filters, clean spring, and bypass valves and inspect cover “O” ring
for damage and deterioration. Replace “O” ring if necessary.
4. Remove and clean the intake suction filter. This permanent screen-type filter is located
inside the reservoir on the intake to the pump manifold. Access to this filter is gained
by removing the cover with the filter holding device from the top of the reservoir.
Remove the “O” ring from the filter and inspect the “O” ring for damage and
deterioration. If it is damaged or deteriorated at all, replace the “O” ring. Clean the
filter by immersing it in a non-caustic cleaning solvent. Rub the screen with a soft
brush to dislodge accumulated foreign matter.
KEEP THE COVER PLATES ON THE RESERVOIR TO PREVENT ANY
CONTAMINANTS FROM ENTERING.
5. Clean the reservoir by either steam cleaning or flushing with diesel fuel.
If steam is used, steam clean the reservoir thoroughly and allow it to drain and dry
completely.
If diesel fuel is used to clean the reservoir, replace the drain plug and admit about ten
gallons of fuel to the reservoir, preferably under pressure. Allow the fuel to remain in
the reservoir long enough to thoroughly clean it. The suction filter may be conveniently
cleaned at this time. Remove the drain plug, drain out the fuel and dry out the reservoir.
6. Replace the suction screen and reinstall the cover and filter hold down device.
7. Install a new return line filter. Reinstall the spring, bypass filter and cover.
8. Refill the system with new hydraulic oil as recommended in Section 4.
361P/N 12261-683 REVISED: January 2015
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