swaploader SL-520X - Jib Lockout Valve Inspection & Adjustment Instructions

SectionIV:Maintenance

4.0.MAI.SL-520X
JIB LOCKOUT VALVE INSPECTION & ADJUSTMENT INSTRUCTIONS
All SwapLoader hook-lift
hoists have a jib lockout
valve 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 main frame approximately two-thirds of the way back on the driver side of the hoist
(see Jib Lockout Valve Mount Detail on Pg. 5-2 of the Parts Section 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. With the hoist pivot joint in the
down position, or horizontal to the hoist main frame, the valve ramp should be in contact with
the jib lockout valve roller. The roller should be depressed by the valve ramp by 1/4" to 5/16”.
4-5