86
TK 55676-19-IM-EN
APU Engine Start-up Procedures
IIm
mp
po
orrtta
an
ntt:: To avoid damage to the APU engine and A/C compressor, verify the APU engine has proper amount of oil
and the A/C system has a partial refrigerant charge b
be
effo
orre
e starting the engine.
IIm
mp
po
orrtta
an
ntt:: Units equipped with the Closed Loop Cooling Option only - Check sight glass on overflow tank to confirm
coolant level before starting the APU’s engine.
TriPac APU Oil Specifications
Oil Capacity
4.5 qts.(including filter) 6.5 qts. Maximum
Oil Type
10W-30 for temperatures at or above -13 F (-25 C)
5W-30 for temperatures at or below -13 F (-25 C)
Bleeding the Coolant System – APU’s Equipped with Traditional
Tractor Coolant Integration
1. Verify A
AP
PU
U O
OU
UT
TL
LE
ET
T hand valve is C
CL
LO
OS
SE
ED
D (tractor inlet, next to water pump). 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.
2. Open the A
AP
PU
U IIN
NL
LE
ET
T hand valve.
3. Place a clean container under the bleed line to catch coolant that is drained.
4. Open the bleed petcock on the APU engine to allow air to bleed out.
5. When a steady stream of coolant flows from the bleed line, close the petcock.
6. Open the A
AP
PU
U O
OU
UT
TL
LE
ET
T hand valve.
7. Replace drained coolant from the TriPac back into the tractor’s radiator.
8. Bleed TriPac fuel system. See “Bleeding the Fuel Lines”.
IIm
mp
po
orrtta
an
ntt:: Verify the APU engine has proper amount of oil and the A/C system has a partial refrigerant charge
before starting the engine.
N
No
otte
e:: See “Service Run-In Test” before performing the Run-in Procedures.
9. Start the TriPac engine.
10. The remaining air in the system will be forced to the tractor radiator and the TriPac APU should now be bled of all
air.
Bleeding the Coolant System – APU’s Equipped with Closed Loop
Cooling Option
IIm
mp
po
orrtta
an
ntt:: Do not start the engine without bleeding the air out of the engine block. If an engine runs with air trapped in
the block, the engine may be damaged. The high water temperature switch may not protect an engine that
has air trapped in the block, because the high water temperature switch is designed to protect an engine
from overheating due to failures in the cooling system and the loss of coolant.
Often when a TriPac unit cooling system is refilled, air is trapped in the engine block and/or under the thermostat. Use
the following procedure to bleed air out of the block and the cooling system:
1. Place a clean container under the TriPac bleed line to catch the coolant that is drained.
2. Open bleed petcock on the TriPac engine to allow air to bleed out.
N
No
otte
e:: Units built prior to September 2006 have the bleed petcock on top of the thermostat housing. On theses units,
remove the water pump bleeder bolt and bleed the air until there is a stead stream of coolant. Then reinstall the
water pump bleeder bolt.
3. Slowly pour coolant into the expansion tank until a steady stream of coolant flows from the bleed line, then close
the bleed petcock.
4. Slowly pour coolant to the expansion tank until the coolant level is at the top of the window in the expansion tank.
5. Install the expansion tank cap.
6. Bleed the TriPac fuel system. See “Bleeding the Fuel Lines”.
