MAINTENANCE CHECKS A regular program of peri-
odic maintenance is an essential part of continued hy-
draulic system operation. Allowing accumulations of
moisture and sediment to build-up in the system will
damage hydraulic valves, pumps and motors. The
presence of leaking connections or damaged compo-
nents effect the efficiency of operation and are danger-
ous. The materials presented here are listed in
accordance with the MAINTENANCE CHECK LIST.
Consideration of severe working conditions may dic-
tate a revision in scheduling periodic checks.
DAILY:
HYDRAULIC FLUID LEVEL The hydraulic reservoir,
fluid level indicators, and filler cap are on the right side
of the machine.
Retract all cylinders to return the maximum amount of
oil to the reservoir and note the oil level indicators. The
fluid level should be between the indicators. The top
mark indicates system capacity with all cylinders re-
tracted. Reservoir capacity is 179 gallons and system
capacity varies with equipment up to a maximum of ap-
proximately 278 gallons.
Do not overfill.
Refer to Section 4, page 23 for hydraulic oils meeting
the manufacturer’s specifications. Do not use oils
which have detergent additives.
The hydraulic reservoir is sealed and has a 14 psi relief
valve. Exercise extreme care when removing the filter
cap. The pressure is relieved by turning the reservoir
cap counterclockwise to the first stop. DO NOT turn the
cap beyond the first stop until all pressure has been re-
leased. This will cause the cap to be blown off the res-
ervoir with sufficient force to cause personal injury. DO
NOT place any portion of your body above the reser-
voir cap while relieving the pressure or removing the
cap.
HYDRAULIC COMPONENTS Check the hydraulic
valves, motors, pumps, hoses, tubes and connections
for excess dirt, oil and grease. Clean these items if
necessary and check for leaks and damage. Tighten
leaky connections and repair any damaged compo-
nents.
WEEKLY:
RETURN LINE FILTER Change the hydraulic reser-
voir return line filters after the first 40 hours of the
break-in period; thereafter follow the quarterly check
recommendation.
MONTHLY:
HYDRAULIC RESERVOIR Drain any accumu- lated
moisture from the hydraulic reservoir by parking the
machine on a slight incline and loosen the pipe plug in
the bottom of the reservoir.
HYDRAULIC OIL Visually check the condition of the
hydraulic oil once each month. Thickening of the oil or
a change in its appearance, such as darkening, may
serve as a rough indicator of when an oil change is
needed. Periodic testing of the oil is the safest, most
accurate method of determining the condition of the oil.
An oil supplier can be consulted for assistance in test-
ing the oil.
Change the oil whenever testing and/or inspection re-
veals the oil to be unsuitable for safe and efficient op-
eration.
MAINTENANCE AND LUBRICATION
HYDRAULIC SYSTEM MAINTENANCE
RESERVOIR
FLUID LEVEL
INDICATORS
4 - 19 Revised: March 2005RT700 Series
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