Simpro QUIKSTAK QS10MM, User Manual

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4.5.4.2 Pressure-relief valve
This is a spring-loaded valve which allows oil to flow back into the reservoir when the
hydraulic pressure exceeds its rated limit
– usually from attempting to lift an excessive load, or
trying to raise the forks when they are already at the upper limit.
4.5.4.3 Lowering valve
This is a solenoid-operated valve which opens when the LOWER circuit is activated, allowing
oil to flow back to the reservoir and lowering the forks.
4.5.4.4 Lowering-speed valve
This is a pressure-compensating valve which limits the maximum flow rate of oil passing back
to the reservoir, thus regulating the descent speed of the forks (regardless of the load).
4.5.5 Lift ram
The Quikstak has a single lift ram of the single-action displacement type. The ram has a
Ø35mm chrome bar, a set of wipers and seals
, and a roller to transfer
motion to the roller chain. Hydraulic lines run from the powerpack to the lift ram.
4.5.6 Roller chain
The Quikstak is fitted with a heavy-duty roller chain, which passes over the ram roller to
transfer lifting motion to the fork carriage. An adjustable chain-anchor allows the effective
length of the roller chain to be adjusted if necessary.
If the roller chain has too much effective length, the maximum lifting height will be
reduced; conversely, if the chain is too short, the forks will not lower right to the ground.
4.5.6.1 Adjusting the chain length
Observe the following procedure to adjust the roller chain:
1. Park the Quikstak with no load as per §2.6 , taking particular care to lower the forks
completely, remove the key from the key-switch and depress the EMERGENCY STOP.
2. Unscrew and remove the four screws holding the perspex guard panel onto the mast,
and remove the panel.
3. Loosen the third M16×1.5 locknut at the bottom of the chain-anchor bolt.
4. Shorten or lengthen the chain as required:
a. To shorten the chain, adjust the first locknut (above the anchor plate)
upwards as desired, followed by the second locknut (below the anchor
plate). This will pull the anchor bolt downwards a corresponding distance,
shortening the chain and increasing the maximum lift height.
b. To lengthen the chain, adjust the second locknut (below the anchor plate)
downwards as desired, followed by the first locknut (above the anchor plate).
This will push the anchor bolt upwards a corresponding distance, lengthening
the chain and allowing the forks to descend further.
5. Once adjustment is complete, check that both the first and second locknuts are tight
against the anchor plate, then re-tighten the third locknut.
6. Raise and lower the forks completely to test the travel before refitting the perspex
guard panel.
Keep hands well away from the lift ram and chains when testing with guarding removed.
1030381547
1030381518
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1.6m lift 1030381540 1.9m lift 1030381542
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1.6m lift 1030381541 1.9m lift 1030381543