National Crane Published 08/16/19 Control # 112-05 9-7
500E2 SERVICE MANUAL CRANE INSTALLATION
PTO HORSEPOWER REQUIREMENTS
The unit is equipped with a three section pump that supplies
34 GPM (129 LPM) to the hoist, 18 GPM (68 LPM) to the
boom and outriggers, and 10 GPM (38 LPM) to the swing
(turn) circuit. To provide these flows, the pump shaft must
turn at 2500 RPM. The PTO requirement is a torque rating of
at least 200 ft-lb (271 Nm) or 40 HP (30 KW) per 1000 RPM
of PTO shaft speed.
Direct Mount Pump to PTO
Most pump installations can be direct mounted to the PTO
using adapter assemblies available from the PTO supplier. If
the pump is direct mounted, its weight should be supported
by a strap between the pump and the transmission. The
splined shaft coupling in a direct mount pump installation
requires lubrication. #200S Silver Streak Special Multi-Lube
(Medium) needs to be applied to the shaft during original
installation and re-applied to the shaft or zerk provided on
PTO housing shaft semi-annually thereafter.
Pump Rotation
It is imperative that the three section hydraulic pump
installed in a 500E2 Service Manual application be the
correct pump rotation configuration for the truck drive train/
power take off rotation direction. Make certain which
direction the power take off output shaft rotates before
selecting a clockwise (cw) or counter-clockwise (ccw)
rotation hydraulic pump. Either cw or ccw rotation pumps are
available, and are marked clearly with a directional arrow on
the pump housing.
Do not confuse engine crankshaft rotation with power take
off rotation. If the power take off shaft rotates opposite the
engine crankshaft, it is turning in a clockwise (cw) direction
when viewed from the rear of the truck and if the power take
off shaft rotates the same as the engine crankshaft it is
turning counter-clockwise (ccw).
Operating speeds and performance of the crane are based
on proper pump outputs to the hoist, lift, telescope and swing
circuits. A triple pump system is standard equipment on the
600D. This pump supplies 34 (129), 18 (68) and 10 (38)
GPM (LPM) to the appropriate crane circuits when operating
at 2500 RPM.
The speeds shown below are optimum operating speeds.
The engine must be operated at a speed such that the
horsepower developed is adequate to pull the pumps under
pressure.
See pump rotation section to determine correct pump for
your application.
CAUTION
To avoid pump failure, do not turn the pump in the
opposite direction of the indicating arrow on the pump
housing.
ENGINE SPEED
(RPM)
PTO RATIO
2400 RPM PUMP
2900 86%
2800 89%
2600 96%
2500 100%
2400 104%
2200 114%
2000 125%
1800 139%
1600 156%
1500 167%
Gasoline Engine
Optimum Speed
Range
Diesel Engine
Optimum Speed
Range
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