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Figure 1
Needle Bearings
Replace Bushing
Improved
Cylinder Block
Motor
End
(B)
Heavier
Snap Ring
Improved Valve Block
Eliminates Valve Plate
Motor
Heavier Snap Ring
Fan Secured by Set
Screws
Pump
End
(A)
Improved
Seal
Improved Draw
Bolt Design
Pump
Improved
Seal
New
Heavier
Mounting
Figure 2
Standard Key Step Key
D. Circuit Connection
Connections between the pump and motor of the TR3 unit
are self-contained. When the PTR3 pump and MTR3 motor
are connected together, they should be connected in a
closed circuit. Supercharging pressure (30 psi) is provided
by an integral supercharging pump in the PTR3 unit. If the
PTR3 pump is used in an open circuit, the inlet must be
superchrged at 30 psi. The MTR3 motors can either be used
in a closed circuit supercharged at 30 psi or in an open
circuit with a means of maintaining 30 psi back-pressure at
the outlet.
E. Power Source
This should be an 1150-1800 rpm electric motor or
equivalent. The source must supply 1/4 horsepower more
than the required output.
F. Load
The maximum load which may be driven by these units is
3/4 horsepower. The 40 inch pounds of torque output will
equal more than 3/4 horsepower at 1800 rpm, and must be
considered available for starting or short intervals only.
CAUTION
Stalling the output shaft for any length of time
should be avoided. Pump delivery passing over the
relief valve generates heat, which can cause
damage to these units.
G. Direction of Rotation
Pump (input) shaft rotation can be clockwise or
counterclockwise. The direction of motor (output shaft)
rotation is changed by actuating the pump control to the
other side of neutral.