FMI PTW72, Manual, Page: 30 / 335

(40) hours of operation.
f. Jack Screws & Nuts : The lift carriage frame is horizontally positioned by a total
of four (4) jack screws (1 at each corner of the frame). Each jack screw and each
jack nut contain a grease fitting for lubrication. A total of eight (8) grease fittings
should be lubricated with a lithium base grease approximately once every one-
hundred sixty (160) hours of operation.
Hydraulic Power Units
Today's hydraulic systems will give many years of trouble free operation when properly
maintained. Studies have shown that over 60% of all hydraulic systems down time can
be attributed to untidy maintenance, and lack of proper filtration. If the hydraulic fluid
becomes contaminated, orifice blockage, valve sticking, internal wear of hydraulic
components, pressure loss, and even pump failure can occur. The following guidelines
are given as minimal requirements under normal shop conditions.
a. Initial Oil Change : Change the hydraulic oil, clean the tank, and replace the return line
filter cartridge after the first two-hundred fifty (250) hours of operation. See tag on
power unit for proper type of hydraulic oil. Various pumps are used on FMI power
units; so see tag for the type of oil used in your particular units.
b. Oil Change Requirements : Replacing system fluid is dependent on several factors
according to the degree of aging or contamination of the oil. Franklin recommends in
the absence of other checks that the oil be changed every 2000 hours of operation for
normal shop conditions. Keep a running check on the oil conditions, take a sample of
the oil and pass it through filter paper or clean cloth. The coloring of the residue will
indicate the degree of aging. If the color is blue/black, an oil change is required
immediately. Old and contaminated oil cannot be improved by topping up with fresh
oil. The used oil should be completely drained while at working temperature and
properly disposed of.
c. Filter Element : The hydraulic filter element must be replaced when dirty. Standard
FMI power units contain a Differential Pressure Indicator. This is simply a gauge on
the filter that indicates pressure buildup on the front side of the element. Check the
Differential Pressure Indicator at least once a week. The element must be replaced
when the Differential Pressure Indicator indicates service is required. The following
steps should be followed when changing a filter element:
1. Lock-out power from the power unit. Check gauges to be certain all pressure is
removed.
2. Remove cover.
3. Remove insert (bridge which holds the element in place).
4. Remove bypass spring assembly from the stud.
5. Remove contaminated cartridge with a twisting motion.
6. Discard disposable element cartridge.
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