Advanced Products

Model: OK1

OK1 Hydraulic Oil Cooler

The OK1 provides up to 40,000 Btu/h of heat rejection. This rugged and efficient remote-mount unit is perfect for any oil or glycol cooling needs including trucks, off-highway construction vehicles, farm and forestry equipment, etc. It features a variable-speed EMP fan with long-life brushless motor and full reversibility to keep the heat exchanger clean through years of harsh use. The OK1 is available in 12V and 24V, pusher and puller models. Control strategy can be configured as temperature control, PWM or CAN control, or simple on/off. Temperature controlled OK1 models feature the EMP uTMC system controller.

Front View
Installed View
Installed View

Features & Benefits

EMP Brushless Electric Fan

All OK1 coolers feature an EMP fan. EMP's fans are brushless, controllable, reversible, and built from a cast aluminum shroud that can withstand even the harshest environments. Learn more about EMP''s FiL-11 electric fan.


Type Specification Description
Max Heat Rejection Rate 40,000 Btu/h
Overall Package Weight 33 lbs.
Heat Exchanger Material Aluminum
Shroud Material Steel
Max Ambient Operating Temp. 203 F
Min Ambient Operating Temp -40° F
Max Oil Temp 266 F
Fan Configuration Push or Pull
Voltage 12 or 24 Volts
Max Current 25 Amps
Max Fan Speed 4000 RPM (14V)
4600 RPM (28V)
Max Continuous Operating Pressure 230 psi
Internal Bypass Pressure Valve 45 psi
SAE O-Ring Boss Port Size -16 (1 5/16"-12)
Maximum Oil Flow Rate 45 GPM
Heat Exchanger Fluid Volume 0.6 gal.
Control Inputs On/Off, CAN/J1939, PWM or Thermistor
Maximum Fluid Viscosity 77.5 ft2/hr
Fan Reversal Control Push Button, Timed, or Ignition On


Please click on the thumbnail below to view a larger version of the image.


The following kit options are available for this product. Any combination of options below can be choosen to configure the kit to your needs.

Voltage Configuration
12V 24V Push Pull
Control Optional Approval Rating
On/Off Temp. Control J1939 CAN PWM UL-Approved CSA-Approved



OK2 Hydraulic Oil Cooler for Loader

Downloads & Documents

The following documents are available for this product. Please feel free to download to obtain additional product information.