HYD0044 DL Cooling System
HYD0044 DL Cooling System
HYD0044 DL Cooling System
DL Wheel Loader
Feb, 2009
Overseas Product Support Team
Text No. HYD0044
Cooling system
Fan motor
(Variable speed motor)
Cooling fan
Coolant temp. sensor
Controller Tank
Reverse fan
T/Mission temp. sensor
Reverse fan signal
Fan RPM is changed by coolant temp. & transmission oil temp.
1
Cooling system
1. Engine.
2. Brake & pilot pump.
3. Cooler.
4. Electronic unit (ECU)
5. Fan motor.
6. Cooling fan.
7. T/M oil temperature sensor .
8. E/G coolant temperature sensor.
9. Transmission.
2
Cooling system
Fan speed
proportional valve
Sequence valve
Relief valve (190bar)
(120bar)
3
Cooling system
Target temperature
- Coolant : 85˚C ~ 95 ˚C
- Mission oil : 95˚C ~103˚C
Water circuit
4
Cooling system
Inlet port
②
Drain port
Outlet port
③
①
6
Cooling system
7
Cooling system
Resistance 25 Ω (@20℃)
8
6) Power train.
9
4. Hydraulic system
6) Power train
I. Transmission.
¾ Applied transmission on DL machine.
10
4. Hydraulic system
6) Power train
I. Transmission.
¾ Torque converter. Pump
(Connected with engine)
One of clutch,
Transmit (engine) power to power user by fluid not
using friction disc.
Turbine
(Connected with power user)
Fluid in side
11
4. Hydraulic system
6) Power train
I. Transmission.
¾ Torque converter theory.
Turbine Pump
(Connected with T/M input shaft) (Connected with flywheel)
12
4. Hydraulic system
6) Power train
I. Transmission.
¾ Torque converter theory.
Pump
Turbine (Connected with
engine flywheel)
Pump is rotating by engine power Then, turbine will be rotating by pump power with
fluid oil in converter, wheel loader uses turbine
power for traveling.
13
4. Hydraulic system
6) Power train
I. Transmission.
¾ Operation torque converter.
Stator
Turbine Pump
14
4. Hydraulic system
6) Power train
I. Transmission.
¾ Freewheel stator.
Stator turning : Fixed When turbine speed is below If turbine speed is above 80% ~
Stator turning : Turn to same 80% ~ 85% of pump speed, 85% of pump speed, stator is
direction with pump & stator stator is fixed. turning with pump & stator together
together (Installed one way clutch) (Oil hits inside impeller) (Oil hits behind impeller)
15
4. Hydraulic system
6) Power train
I. Transmission.
¾ Freewheel stator benefit.
16
4. Hydraulic system
6) Power train
I. Transmission.
¾ Torque converter in transmission.
Turbine
Turbine Pump
Pump
Stator Stator
17
4. Hydraulic system
6) Power train
I. Transmission.
¾ Drive shaft in transmission (connect with torque converter)
18
4. Hydraulic system
6) Power train
I. Transmission (DL200 / DL250 / DL300)
¾ Internal section.
19
4. Hydraulic system
6) Power train
I. Transmission (DL200 / DL250 / DL300)
¾ Exterior view ( I )
1. Lifting plug.
2. Diaphragm.
3. Transmission suspension hole .
4. Attachment for emergency steering pump.
5. Model I/D
6. Output flange converter side.
7. Oil drain plug.
8. Attachment for oil filter pipe.
9. Oil dipstick.
10. Torque converter.
20