Mercedes-Benz Series 405 Introduction Into Service Manual page 11

Innovations
High-performance engine brake
The engine brake developed by Mercedes-Benz significantly
reduces the wear on the wheel brake systems and makes a
significant contribution to the cost-efficiency of the vehicle.
The engine brake is designed as a dual-pulsed decompres-
sion brake and provides a high level of brake power.
• Each cylinder in the engine has its own engine brake unit.
Fan hydraulics with variable displacement pump
The fan hydraulics are included in the basic scope of all
vehicles.
• Greater efficiency of fan hydraulics due to variable dis-
placement pump and demand-based, separate control of
both fans.
Tilting hydraulics based on fan hydraulics
The tilting hydraulics allow the vehicle tilt cylinder to be ad-
justed and can be extended to allow the adjustment of exter-
nal consumers (e.g. rail guide or auxiliary rear axle steering)
(but not permanent consumers).
• Simple tilting hydraulics for the vehicle tilt cylinder (code
HE1)
• Tilting hydraulics with additional connection option for ex-
ternal adjustment operations (code HE2) e.g. trailer with
tilt system.
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Working/municipal hydraulics (circuit I and circuit II)
The working hydraulics allow an implement to be adjusted
or a permanent consumer to be supplied. On the 1-circuit
hydraulic system one circuit is available for this, while on
the 2-circuit hydraulic system, two independent circuits are
available, each with its own fixed displacement pump.
This allows adjustment operations to be carried out and a
permanent consumer to be supplied simultaneously. On the
2-circuit hydraulic system, the volumetric flow rates can be
swapped over via the volume switchover function or added
together via flow summation.
Changes compared to the hydraulic system of Euro V
vehicles:
• Fully proportional working hydraulics at connections of
cells 1–4 (connections 1-8)
• Integrated pressure filter
• Control of consumers during adjustment operations via
the vehicle joystick (social distribution) with diagonal
movement of vehicle joystick. Due to the omission of link
motion, two adjustment operations can be carried out
simultaneously. Example: Raise front loader and tilt shovel
simultaneously
• Hydraulic connection possibility on valve block (e.g. for
roll stabilization)
• Electrical interface for actuation of hydraulic valve block
(circuit I) e.g. for external actuation of front and/or rear
power lift
• Joystick with rocker switch for forward/reverse shifting of
manual vehicle transmission
Introduction of the New Unimog Generation | Model Series 405