COOLING SYSTEM SECTION 6
Page 1
DRESSTA TD-25M EXTRA
GENERAL
1. DESCRIPTION
Five cooling systems are used on this machine. First system cools the air, after compressing in
engine turbocharging system, second system cools engine coolant, third cools drive train oil, fourth
system cools the fuel of engine fuel system. All four systems use the modular radiator, which is
mounted on front part of the machine. Separated cooler is used for cooling oil in the hydraulic
motor fan drive system. Air flow through the radiators is provided by the hydraulic motor driven
suction fan.
Engine Cooling Systems
Engine intake system is equipped in air-to-air heat exchanger (charge air cooler (CAC) to reduce
intake manifold temperature. The CAC system includes air ducting from the turbocharger
compressor outlet to the CAC air inlet, and from the CAC air outlet to the engine intake manifold.
The charge air cooler is located on the left side of the modular radiator.
The engine cooling system used on this machine is a closed, deaerated with separate auxiliary
tank. Pressure type system permits operation at extreme angle without loss of coolant through the
overflow tube. The cooling system also permits operation at higher engine temperatures without
boiling. The cooler is located on the right side of the modular radiator.
The fuel cooler in the drain line is mounted to make sure the correct fuel temperature is met.
The fuel cooler is located on the right side bottom of the modular radiator.
For detailed information on the engine cooling system components, refer to the Engine Operation
and Maintenance Manual QSX15 Engines, Bulletin No 3666423; Troubleshooting and Repair
Manual QSX15 Engines, Bulletin 3666239 and Troubleshooting Repair Manual Electronic Control
System QSX15 Engines, Bulletin No.3666259.
Drive Train Oil Cooling System
The drive train cooling system uses an oil to air heat transfer type oil cooler to cool the oil used in
the drive train components:
transmission, torque converter and steering.
The drive train oil cooler is located on the left side of the modular radiator near to CAC.
Fan Drive Hydraulic Motor Oil Cooling System
The fan drive oil cooling system uses an oil to air heat transfer type oil cooler, to cool the oil used
in the fan drive hydraulic system. The oil cooler is located on the right side top of engine
compartment mounted to the modular radiator.
2. OPERATION
Engine Cooling Systems (Refer to Fig. 6.1)
Intake Air Cooling
Intake air after passing thru the screen air filter and air filter elements is suck into the
turbocharger (21). Compressed and heated air from the turbocharger is directed to the charge air
cooler CAC (1) (heat exchanger). CAC is connected with the turbocharger outlet and engine intake
connection (22) with the tubes (18, 20) and special vibration resistant hump hoses (19). The hot air
enters to the cooler core (1) and flows down through tubes. Heat is dissipated to the air being
forced past the outside of the core tubes by the hydraulic motor driven fan. CAC system is
designed to achieve 60 [°C] intake manifold temperatures at a 25 [°C] ambient temp.
To Next Page
Loading...