Schwing SPB 28, Operation Manual

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33
Overview
SPB Operation Manual
Safety guards
Safety guards were placed for your protection. Do not
operate the machine unless all the safety guards are
in place. If they become damaged, lost, stolen, or in-
operable for any reason, they must be replaced before
operation continues.
Figure 3
Example Safety Guard - Turret Shroud
Warning Horn
A warning horn is located on the power pack. The horn
will sound if the slewing limits are reached or can be
activated manually.
Manual Activation
The horn can be manually sounded by
activating the switch on the remote
box.
Holding Valves
The holding valves seal the hydraulic cylinder to pre-
vent it from creeping or moving until pressure is applied.
If hydraulic pressure is lost for any reason; for example,
if a hydraulic hose or fitting blows, holding valves will
lock in place and prevent the cylinder from retracting.
If the boom or hydraulic cylinders are drifting, check to
see if the holding valve is defective or the piston seals
need to be replaced.
T
A1
B1
H.E.R Valve
Relief Valve
Figure 4
Boom holding Valve (H.E.R.)
There are relief valves located in the holding valve to
prevent cylinder failure due to excessive pressure and
to prevent boom damage due to excessive forces.
NEVER adjust the relief valve setting on a hold-
ing valve while it is on the boom. There is no way
to tell what pressure setting you are making, and
structural damage could result.