SECTION 7 – HYDRAULICS
7-12 USTC January 15, 2001
MANIFOLD VALVE
The manifold valve is a block valve with two solenoid
cartridges. It is located on the rear of the turntable.
One solenoid stops operation of the hoist up, boom
up, boom down and telescope out functions when the
anti-two-block switch is tripped. The other solenoid
opens the burst-of-speed circuit, adding an additional
24 gpm to the hoist control valve.
The solenoid valve cartridges can be removed and
cleaned, if necessary. Four check valves are also
removable for cleaning.
Figure 7-10. Manifold Valve
The solenoids are interchangeable. To test one of the
solenoids, they can be interchanged if the opposing
solenoid is known to be working.
If the solenoid fails but the cartridge is operational,
replace the solenoid. When reassembling, be sure the
nut is torqued to 12-17 lb-ft. Overtightening can
result in distortion of the cartridge and a sticking
spool.
Courtesy of Crane.Market
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