S0607080K
Page 8
Transmission and Torque Converter
(ZF 4WG-310)
The main pressure valve is limiting the max. control pressure to 16+2 bar (232+29 psi) and releases the
main stream to the converter and lubricating circuit.
In the inlet to the converter, a converter safety valve is installed which protects the converter from high
internal pressure (opening pressure 11 bar (160 psi).
Within the converter, the oil serves to transmit the power according to the well-known hydro-dynamic
principle.
To avoid cavitation, the converter must be always completely filled with oil.
This is achieved by a converter pressure backup valve, rear-mounted to the converter, with an opening
pressure of at least 5 bar (73 psi).
The oil, escaping out of the converter, is directed to a heat exchanger.
From the heat exchanger, the oil is directed to the transmission and there to the lubricating oil circuit, so
that all lubricating points are supplied with cooled oil.
The allocation of the pressure regulators to the single speeds can be seen on the “Schedule of Measuring
Points and Connection 4WG-310” on page 8 and “Oil Circuit Diagram 4WG-310 Forward 1st Speed” on
page 11.
SCHEDULE OF MEASURING POINTS AND CONNECTION 4WG-310
The marked positions (e.g. 53) correspond with the positions on the “Oil Circuit Diagram 4WG-310
Forward 1st Speed” on page 11.
The measurements have to be carried out at hot transmission (about 80
°
- 90
°
C).
No. Denomination of the Position Connection
Marking on the
Valve Block
Measuring Points for Pressure Oil and Temperature
51 In front of the converter - Opening pressure 11 bar M10 x 1 H
52 Behind the converter - Opening pressure 5 bar M14 x 1.5
53 Clutch Forward 16 + 2 bar (232+29 psi) KV M10 x 1 B
55 Clutch Reverse 16 + 2 bar (232+29 psi) KR M10 x 1 E
56 Clutch Reverse 16 + 2 bar (232+29 psi) K1 M10 x 1 D
57 Clutch Reverse 16 + 2 bar (232+29 psi) K2 M10 x 1 A
58 Clutch Reverse 16 + 2 bar (232+29 psi) K3 M10 x 1 C
60 Clutch Reverse 16 + 2 bar (232+29 psi) K4 M10 x 1 F
63 Behind the Converter
Temperature 100
°
C, Short-time 120
°
C
M14 x 1.5
65 System Pressure 16 + 2 bar (232+29 psi) K4 M10 x 1 K
10 Breather M10 x 1
15 Connection to the Heat Exchanger -------
16 Connection from the Heat Exchanger -------
28 To the Filter M42 x 2
29 From the Filter M42 x 2
30 From the Filter Bypass M42 x 2
36 Oil Filter Plug M42 x 2
49 Plug Connection on the Electrohydraulic Control Unit
68 System Pressure (Option) M16 x 1.5 G
69 Control System (Option) M16 x 1.5 J
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