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MHP3 User Manual ◄ 13
OPERATION
OPERATING THE TOOL CIRCUIT
Facing the panel, the male quick disconnect ttings are
the PRESSURE FLUID OUT tting. The female quick
disconnect ttings are the RETURN FLUID IN (RE-
TURN) tting.
PRESSURE (OUT)
RETURN (IN)
The “Dual Circuit” control panel contains connections for
two 5 GPM tool circuits. In addition, the two circuits may
be combined into one 10 GPM tool circuit.
1. If using one 5 GPM tool circuit, select either the up-
per or lower circuit and connect the PRESSURE
FLUID OUT hose to the male coupler and connect
the RETURN FLUID IN (RETURN) to the female
coupler next to it. Connect the other ends of the
hoses to the tool.
If using both 5 GPM tool circuits, connect PRES-
SURE FLUID OUT hoses to the male couplers and
connect the RETURN FLUID IN (RETURN) hoses
to the female couplers. Connect the other ends of
the hoses to the tools.
NOTE:
Before starting the engine make sure the tool circuit
switches are in the OFF position.
The power unit will not start if the tool selector
switches are not in the OFF position.
2. Ensure the throttle control is pulled fully back to the
idle position.
VISCOSITY (FLUID THICKNESS)
U.S. METRIC
50 °F 450 SSU Max. 10 °C 95 C.S.
100 °F 130-200 SSU 38 °C 27–42 C.S.
140 °F 85 SSU Min. 60 °C 16.5 C.S. Min.
Pour Point: –10 °F/–23 °C Minimum (for cold startup)
Viscosity Index: (ASTM D-2220) 140 Minimum
Demulsibility: (ASTM D-1401) 30 Minutes Maximum
Flash Point: (ASTM D-92) 340 °F/171 °C Minimum
Rust Inhibition: (ASTM D-665 A & B) Pass
Oxidation: (ASTM D-943) 1000 Hours Minimum
Pump Wear Test: (ASTM D-2882) 60 mg Maximum
The following uids work well over a wide temperature
range, allow moisture to settle out and resist biological
growth that may occur in cool operating hydraulic cir-
cuits. These uids are recommended by Stanley. Other
uids that meet or exceed the specications of these u-
ids may also be used.
• Chevron AW-MV-32
• Exxon “Univis” J-26
• Mobil D.T.E. 13
• Gulf “Harmony” AW-HVI-150-32
• Shell “Tellus” T-32
• Texaco “Rando” HD-AZ
• Union “Unax” AW-WR-32
• Terresolve EnviroLogic 132
QUICK DISCONNECT COUPLERS
HTMA-approved quick-disconnect couplings are in-
stalled to hydraulic hoses so that the direction of oil ow
is always from the male to the female quick disconnect
as shown on page 10. Quick disconnect couplings and
hose ttings are selected so that additional ttings such
as reducer or adapter ttings are not required.
If adapter ttings are used, they must be approved steel
hydraulic ttings meeting a minimum operating pressure
rating of 2500 psi/172 bar. Do not use galvanized pipe
ttings or black pipe ttings.
Use thread tape or pipe joint compound when installing
quick disconnect couplings to hose or tool ttings. Fol-
low the instructions furnished with the selected thread
sealant. DO NOT OVERTIGHTEN THE FITTINGS.