swaploader SL-400, Parts And Operation Manual

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SL-400.MAI
4-9
07/2009
JIB LOCKOUT VALVE INSPECTION & ADJUSTMENT INSTRUCTIONS
All SwapLoader hook-lift hoists have a jib lockout valve (see illustration below) to prevent
accidental operation of the telescopic jib, while the hoist is up in a dump mode. Because the jib
lockout valve can block the flow of hydraulic oil to the jib cylinder, should the valve come out of
adjustment the telescopic jib may experience a reduction in extension or retraction speed to the
point of stalling out.
INSPECTION
When a noticeable loss in extension or retraction speed of the telescopic jib is experienced, the
first step should be to inspect the jib lockout valve and valve mount ramp to ensure that they are
adjusted properly and in good working order. The jib lockout valve is located on the inside rail
of the hoist mainframe approximately two-thirds of the way back on the driver side of the hoist
(see Drawing No. 42H03 in the Part List pages of the manual). Visually inspect the jib lockout
valve roller and the condition of the valve ramp on the hoist pivot joint without a container on
the hoist (see illustration on the next page); this is most easily performed with the hoist back in a
dismount mode. If either part shows signs of wear or damage then replace or repair as needed.
With the jib lockout valve roller and valve ramp in good condition the next step is to check that
the valve is positioned correctly with respect to the valve ramp. While looking at the roller end
of the jib lockout valve, notice that the roller moves in and out of an end cap. With the hoist
pivot joint in the down position, or horizontal to the hoist mainframe, the valve ramp should be
in contact with the jib lockout valve roller. The roller should be depressed by the valve ramp so
that 1/8” to 3/16” of the roller is exposed from the end cap (see illustrations above and on next
page).
JIB LOCKOUT VALVE ILLUSTRATION
Roller
End Cap
Spring Cap