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PREVENTIVE MAINTENANCE
HYDRAULIC OIL RECOMMENDATIONS
Drott DHF Fluid is recommended for year-around
use in the hydraulic system; or as alternate, use oils
listed below:
SYSTEM
OIL WEIGHT
OPERATING TEMPERATURE
SAE20-20W
50° to 210° F (10° to 99°
C)
SAE 10W
0° to 180° F (-18° to 82° C)
SAE 5W or 5W-20
Arctic Conditions
Viscosity: The viscosity of the oil at starting should
not exceed 9000 SSU or drop below 60 SSU for
sustained high temperature operation. The optimum
operating conditions are between 80 SSU and 180
SSU. The viscosity index should not be less than 90
(for this service).
Arctic Conditions: The use of an auxiliary heater, a
warm-up period avoiding high speed operation of
hydraulic components until the system is warm, and
the use of SAE 5W or SAE 5W-20 oils may be
necessary, provided the viscosity requirements for
sustained high temperature operation are not
exceeded at maximum operation temperatures. See
preceding paragraph on Viscosity.
HYDRAULIC SYSTEM
OPERATING PRESSURES
VALVE
PRESSURE SETTING
PSI
kPa
Main Reliefs
3300
22 700
Hoist Port Reliefs
3400
23 400
Crowd Port Reliefs
3400
23 400
Tool Port Reliefs
3400
23 400
SwinQ Port Reliefs
2500
17 200
Track Port Reliefs
2500
17 200
Power Sensing Reliefs
Case
2800
19 300
D.D.
2600
17 900
Pilot System Relief
550
3 800
Swing Cushion Relief
1550
10 700
Leveler (optional)
2500
17 200
10
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