Kalmar DRD450-80S4X, Maintenance Manual

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UDRF01.04GB
Maintenance manual DRF 400–450
2 Transmission – 2 Transmission 3
mm mm mm mm
2 Transmission
page –
Transmission, function description
The transmission converts the engine power to the drive wheels
(drive axle) via the propeller shaft and also power to drive the hy-
draulic oil pumps for hydraulics and the brake system.
The transmission is fully automatic with torque converter. It has four
forward gears and four reverse gears.
The torque converter and the transmission work together via a com-
mon hydraulic system. The torque converter is a hydraulic clutch
placed between the engine's output shaft and the transmission's in-
put shaft. The hydraulic oil pumps as well as the oil pump for the
transmission's control and lubrication are connected to the torque
converter via power take-offs on the transmission.
Gear positions are selected by pressure modulation with electrical
valves that are controlled by Control unit transmission (D793). The
control unit uses sensors for pressure, temperature and speeds to
determine which gear position shall be activated as well as solenoid
valves to activate the gear.
004728
D793
D790-2 D795
D794
<˚
Pa
1
6
16
9
11
12
15
2
3
21
D797-F
F
R
8
4
7
10
13 14
17
D790-1
18
˚C
Pa
5
19
20
˚C
1. Multi-function lever (S162) 12. Sensor engine speed and oil temperature (B758/766)
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