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TK 55676-19-IM-EN
Tractor Coolant Hose Installation
Preferred Installation – APU Coolant Hoses Tee’d Directly Into Tractor’s
Heater Hoses
NNoottee:: Skip this step if your APU has the Closed Loop Cooling Option.
Coolant Hose Routing and Connections
NNoottee:: If the Arctic Block Temperature Sensor Option is to be installed, it should be installed at this time.
Each coolant hose installation will be different. Carefully review the tractor’s engine cooling system to determine the
best method for installing the cooling hoses and hand valves. Consult tractor dealer or OEM for assistance in
identifying correct coolant hoses or engine fittings required for proper installation.
NNoottee:: All APU coolant hoses should be installed in such a way as to allow the hand valves to isolate the APU cooling
system from the tractor’s cooling system. This hand valve must be located as close to the tractor’s engine as
possible.
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With the tractor’s engine shut off, and the TriPac APU engine operating, warm coolant is circulated from the APU
engine up to the tractor’s engine and then back to the APU engine. This keeps the tractor’s engine warm allowing for
easier cold starts.
• When the TriPac APU engine is running and coolant temperature reaches normal operating temperature of 180 F (82
C), the thermostat will open allowing hot coolant to flow from the APU OOUUTTLLEETT fitting forward to the tractor’s
engine.
• Hot coolant enters the tractor’s engine block through an IINNLLEETT fitting typically located near the water pump.
• Hot coolant circulates through the tractor’s engine block and exits an OOUUTTLLEETT fitting typically used for the heater.
• Warm coolant then returns to the TriPac APU and enters the IINNLLEETT fitting.
• Warm coolant circulates through the APU’s engine block to absorb heat before being pumped back out to the
tractor’s engine.
• Hand valves are installed to allow the APU’s cooling system to be isolated from the tractor’s cooling system to allow
for component servicing.
Installation Procedures
Special Tools Required
Utility Knife
Pipe Thread Sealer
1. Drain coolant from tractor’s radiator and engine. Keep for re-use.
2. Locate HHEEAATTEERR IINNLLEETT coolant hose on tractor’s engine:
a. Cut tractor’s heater inlet hose and install pipe fittings, elbow, tee fitting and hand valve.
b. From the hand valve, connect and route a new coolant hose back to the OOUUTTLLEETT fitting located on the APU.
c. CCLLOOSSEE hand valve.
3. Locate HHEEAATTEERR OOUUTTLLEETT coolant hose on the tractor’s engine:
a. Cut tractor’s heater outlet hose and install pipe fittings, elbow, tee fitting and hand valve.
b. From shutoff valve, connect and route a new coolant hose back to the IINNLLEETT fitting located on the APU
precooler.
c. OOPPEENN hand valve.
4. Install protective plastic sleeving on all coolant hoses and secure coolant hoses with clamps.
5. Make sure the APU OOUUTTLLEETT hand valve (tractor inlet, next to water pump) is cclloosseedd. If this valve is left open,
coolant will be sitting on top of the TriPac thermostat and not allow the TriPac engine to bleed air.
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