SECTION 10
RECIRCULATION SYSTEM
Page 10-5
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10.4 Maintenance Overview
During normal operating condition, the oil will be maintained at the correct
operating temperature.
In order to get the best value from the hydraulic system (including the
recirculation system) one should change the filter element when it indicates
that it is time. The hydraulic oil should be changed after 3,000 hours or 1 year
of service (whichever comes first) or whenever a fluid sample indicates that it is
contaminated and beyond being fixed by simply operating the filter.
Parts: Hydraulic Oil:
General service, use Mobil #DTE Heavy Medium, No.
021029 (KMT Waterjet part 05022702)
Food service, use Conoco AA-20
(KMT Waterjet part 49835762)
Oil with additives such as zinc diophosphate (ZDDP)for
anti-wear are not recommended because of reaction with
water.
Tools: Open End Wrench, 1-1/4”
Rags
Container to collect oil
Oil transfer pump with ¾” hoses. Inlet hose with ½” male
pipe connector, and pump discharge hose with ¾” female
JIC connector.
TABLE 10-3. Hydr Oil Filter Change Criteria
SL-IV Pump
Models
Type of
Indicator
Interpretation of indicator reading
30 hp,
50 hp
Pressure
Gage
Replace filter element when the pressure reading is 1.4
bar (20 psig) above normal when at operating
temperature. Maximum normal pressure is 1.7 bar (25
psig). (Note [1])
60 hp,
75 hp,
100 hp
Differential
pressure
indicator
If the visual indicator (slide bar) is in the yellow zone or
entering the red zone, this is an indication that the oil
filter needs to be replaced. (Note [1])
Note [1]: Perform filter element condition check with SL-IV pump running at normal
oil operating temperature (110-120 deg-F).
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