Gradall 534B (9103-1390) Service Manual - Manual (Page 55)

AUXILIARY HYDRAULIC SYSTEM
When the 534B is equipped with attachments requir-
ing additional hydraulics, such as swing forks or
winch, an additional control valve section is used. It is
located between the Sway Control Valve section and
the Tilt Valve section.
TILT & COMPENSATING CIRCUITS
The tilt circuit raises or lowers the angle of the fork
or other attachment a total of 114°. It is a dual
circuit combining with a compensating cylinder to
automatically adjust the level of the fork
continuously as the boom is raised or lowered.
Movement of the tilt control lever (sway) forward or
backward adjusts the angle of the attachment.
Forward lowers the fork and backwards raises the
fork.
Oil from the Tilt Control Valve section is routed to
both cylinders. The compensating cylinder is a plain
cylinder and the tilt cylinder uses the counter-
balance valve.
Both cylinders are of identical size so that as the
boom angle changes, a like volume of oil is
transferred to or from the tilt cylinder, keeping the
fork level or in the same position.
The tilt cylinder and the compensating cylinder
are the same bore.
The oil lines which are used to carry the oil thru the
booms pass around the rear sheaves on the push
boom assembly.
The oil lines are secured to the front end of the 3rd
section with springs to keep them tight.
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