National Crane Published 10-30-2014 Control # 040-09 2-31
1400H OPERATOR AND SERVICE MANUAL OPERATING CONTROLS
OIL COOLER
Specifications
Fan RPM .................................... 2000
SCFM......................................... 1900 (54,000 LPM)
Voltage ....................................... 12 VDC (Nom.)
Stall Max. Amp Draw .................. 75 A
Operating Amp Draw.................. 18 A
Temperature Switch.................... 140°F (60°C)
Oil flow through heat exchanger at 180°F (82 C) oil is 30
to 50 gpm (113 to 189 lpm) variable with pump and engine
rpm.
Maximum operating oil temperature 210°F (99°C)
Operation
The oil cooler system consists of a 15 psi (1 bar) relief valve
and a self-contained heat exchanger in parallel with the relief
valve in the hydraulic system return line.
After the truck has been started and PTO engaged, oil flow
will be determined by oil viscosity. During cold weather
operation, most of the return oil will flow over the 15 psi
(1 bar) relief valve because of cold oil in the heat exchanger.
As the hydraulic oil heats up with crane operation, oil flow
through the heat exchanger will increase and pressure
through the exchanger will decrease due to thinner (less
viscous) oil.
When the oil temperature heats up to approximately 140°F
(60°C), the electric cooling fan will automatically be switched
on and the hydraulic oil will be maintained at an acceptable
operating temperature [under 210°F (99°C)]. The operating
temperature will vary depending on ambient air temperature
and duty cycle. To cool the oil in the reservoir rapidly, the
operator may retract then extend the telescope and/or lift
cylinder in order to exchange cool oil in the cylinders with the
hot oil in the reservoir. Consult Service and Maintenance
Section for inspection and cleaning requirements.
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