Wacker Neuson 28Z3, Service Manual

Page: 151 / 264

SHB 28Z3 EN – Edition 2.0 * 28z3s510.fm
5-19
Hydraulic system
5.4 Regeneration – stick section
Problem
High loads on the stick can cause the stick ram to be “emptied” on the base side, which
can cause the stick to stop in vertical position.
Solution
A non-return valve is integrated in the stick segment so the rod-side oil can flow to the
base side.
Location
The regeneration valve is located in the stick segment on the lower side.
5.5 Bucket pre-tension
A nozzle is integrated in the pressure line of the bucket segment. If the bucket and the
boom (both supplied with oil by the same pump) are actuated at the same time, both move
simultaneously, and not the bucket (with its smaller mass) first, and then the boom with its
larger mass
– see Main valve block diagram on page 5-15.
Location: