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37. MECHANICAL LIFTING GEAR

Lifting:

A voltage is applied to the lifting gear switch

(C739), the electronic unit of the lifting gear

(D503) and the approximation switch for axle

load protection of lifting gear (10 tonnes) (E507)

through fuse E062 and wire 1221.

If the switch is switched into the ‘lifting’ position

(connection between points 3 and 1), valve

B071 (lifting-gear lifting valve) will be activated

through wire 4550. A voltage is also applied

through contacts 30 and 87a of relay G066

(lifting-gear take-over relay). As a result, the

lifting-gear motor relay (G052) will be activated,

thus activating the lifting-gear pump motor

(B073).

If the pressure has increased to 160 bar, the

control switch for lifting-gear oil-pressure limit

switch (E524) will be activated, thus activating

the lifting-gear take-over relay (G066) as a

result of which the contact of this relay will

switch from connection 30/87a to connection

30/87.

This will switch off the lifting-gear pump motor

(B073) and the pressure will fall to below

160 bar, so that the control switch for the

lifting-gear oil-pressure limit switch (E524) will

resume its neutral position.

If the switch on the dashboard is released, the

supply is disconnected and everything returns to

the starting position so that no more lifting takes

place.

Lowering:

Manual control:

A voltage is applied to the lifting gear switch

(C739), the electronic unit of the lifting gear

(D503) and the approximation switch for axle

load protection of lifting-gear (10 tonnes) (E507)

through fuse E062 and wire 1221. If the switch

is switched into the ‘lowering’ position

(connection between points 7 and 1), a voltage

will be applied to point S1 of the lifting gear’s

electronic unit (D503). This unit will apply a

voltage to point 87 for 2,5 minutes.

If within this 2,5 minute period the

dashboard switch is engaged again, the

electronic unit will reset and another 2,5

minute period will start.

As a result, the lifting-gear motor relay (G052)

will also be activated, thus activating the

lifting-gear pump motor (B073). The motor is

activated through D623, relay G066 (connection

between points 30 and 87a) to connection point

85 of relay G052. At a pressure of 160 bar, the

oil-pressure limit switch (E524) switches off the

lifting-gear pump motor (B073) through relay

(G066) and relay (G052).

During the 2,5 minute period, the trailing axle

cannot be lifted as the 4/2 valve (B072) remains

activated. This valve should be in the

non-activated position (see hydraulics diagram).

Automatically:

If the axle pressure of the driven axle exceeds

10 tonnes, the trailing axle is lowered

automatically.

10-TONNES AXLE LOAD PROTECTION

If the driven rear axle is loaded with a weight of

10 tonnes or more, a signal is sent by the

approximation switch for axle load protection

(E507) to input S2 of the “lifting gear electronic

unit”. The signal sent by the approximation

switch for axle load protection (E507) to S2

should last for at least 10 seconds before the

lifting gear electronic unit (D503) will activate the

valve (B072) and the lifting-gear pump motor

(B073), so that the trailing axle is lowered. This

is to prevent the driven axle from exceeding the

legal maximum axle load maximum (10 tonnes).

VARIANTS

Location

5 This wire should be connected directly to

the battery.

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