STAS STAS M, Instructions For Use Manual

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STAS nv – Flanders Fieldweg 45 – 8790 WAREGEM (BELGIUM) Instructions for use, tipper trailer – Version 3.1
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3. Venting the hydraulic cylinder
When the cylinder jolts outwards this can be a result of air in the cylinder.
Depending on the type of hydraulic cylinder a different procedure is used to vent it.
Before venting always check there is sufficient oil in the tank on the trailer or
lorry. Air in the hydraulic circuit is often caused by tipping with insufficient oil
in the tank.
3.1 . H yd raul ic c y lind e r of t he m ak e HY V A
Cylinders of the make Hyva have automatic air venting. The air disappears from the cylinder after a
number of times of tipping. In any case check there is sufficient oil in the hydraulic tank.
3.2 . H yd raul ic c ylind e r of t he m ak e ED BRO
This cylinder has a venting bolt.
Make sure that no one is located near the tipping body. Remember that during
venting the tipping body will lower.

Raise the tipping body 20 centimetres using the cylinder (see § 2.3.2 for the procedure).
 Remove the plastic protective cover.
 Slowly turn the venting bolt open so the air can escape from the system. Caution: the tipping body
will slowly lower and force the air out of the system.
Figure 3.2.a. – Cylinder venting
 When only oil comes out of the opening tighten the bolt.
 Allow the tipping body to fully lower, check the oil level and top up if necessary.
 If the cylinder still jolts: carry out the procedure again.
F PREVENTIVE MAINTENANCE

Ensure that no one is able to activate the tipping mechanism or the
hydraulic rear door when work is being carried out in the trailer.
 It is recommended that a second person supervises whilst work is being
carried out in the trailer.
Preventive maintenance on the trailer may be divided into the following sections:
 Mechanical maintenance of the trailer (see § 1)
 Maintenance of the bodywork of the trailer (see § 2)

Maintenance of the hydraulic tipping cylinder (see § 3)
1. Mechanical maintenance
1.1 . Vi sua l ch ec ks
A general visual inspection of the trailer should be carried out at regular intervals and any damaged or
faulty components must be replaced or repaired immediately.
1.2 . T yr es
Visually check the tyre pressures before each trip. Tyre pressures should be measured weekly and
adjusted if required. The table below shows the recommended tyre pressure and rims for the most
common tyre sizes. If the trailer is fitted with a different tyre size, the correct tyre pressure may be
obtained from the manufacturer.
Tyre size Rim width (advice)
Recommended tyre
pressure (bar)
425/55 R19.5 13.00 x 19.5 9
445/45 R19.5 14.00 x 19.5 9
445/65 R19.5 14.00 x 19.5 8.5
11 x 22.5 7.50 x 22.5 8
12 x 22.5 8.25 x 22.5 8.5
13 x 22.5 9.00 x 22.5 8.5
365/80 R20 10.00 x 20 9
385/65 R22.5 11.75 x 22.5 9
425/65 R22.5 13.00 x 22.5 8.5
445/65 R22.5 14.00 x 22.5 9