OM 803 us – Edition 3.7 * 803b340.fm 3-75
Operation
3.19 Pressure release on the auxiliary hydraulics
Before connecting or removing hydraulic lines from an attachment with
hydraulic functions, ensure that the hydraulics are not under pressure!
Ensure that no one is in the danger zone of the machine
The hydraulic system of the machine is still pressurized even when the engine
is not running! The hydraulic quick couplers can be released, however they
cannot be re-attached due to the residual pressure in the lines.
• Release the pressure.
• Release the pressure in the sections of the system and hydraulic lines that are to
be opened before starting setup or repair work, for example fitting/removing an
attachment!
Releasing pressure
Release the pressure as follows:
☞Park the machine on level and horizontal ground.
☞Lower the boom and the attachment completely to the ground.
☞Stop the engine.
☞Lower (unlock) the lock lever.
☞Move the control levers in all directions repeatedly.
➥The pressure in the system sections that have been actuated is released. This can
be seen by the brief movement the hydraulic hoses make as the pressure is actually
released.
➥Uncouple the attachment immediately after the pressure has been released,
otherwise pressure can be created again!
3.20 Re-equipping attachments
Re-equipping the attachments is described below for a bucket. If you are fitting or remov-
ing attachments with their own hydraulic functions – grab or offset bucket, for example –
you must follow the special information given in the Operator’s Manual of the attachment.
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