Periodic Maintenance; Wear Inspection - Cascade Viewmast II 30C Triple Installation Instructions Manual

9. Lowering Speed Adjustment - Quad Mast
The adjustable lowering control valve is located In the
supply port of the cylinder shell. It consists of a spring,
adjustable piston, adjustrng nut and body. By adjusting the
piston you can control the lowering speed of the cylinder.
a.
Remove the plug and lowerrng control valve from the
cyl under port.
b. Adjust as follows:
l
To SLOW the LOWERING SPEED, back the nut out
while keeping the piston statronery with a screwdriver.
See Figure 18.
l
To INCREASE the LOWERING SPEED, tighten the
nut while keeping the piston stationery with a
screwdriver.
c.
Reinstall the valve and tighten to a torque of 10-l 5 ft.-lbs
L
BODY
PISTON
NUT
Install the plug and tighten to a torque of 95-100 ft.-lbs.
Figure 18. Lowering Control Valve.
PERIODIC MAINTENANCE
For proper operation
and an extended service life, your
Viewmast II should be inspected and serviced regularly as part
of your normal lift truck maintenance schedule according to
the following outlines.
The recommended intervals are for masts operating under
normal conditions. If the
mast is operating in severe conditions
or very corrosive atmospheres, these operations should be
performed more frequently.
WARNING
A
Never work on the mast with a load on the forks
or attachment or while anyone is near the lift
truck control handles.
Daily Inspection
Perform the following at the beginning of each work shift:
1.
Extend the carriage a few inches off the ground and make
sure the carriage chains are under equal tension.
2 Extend the mast to its full height to make sure the hoist
cylinder sequences properly. The priman/ plunger should
fully extend, then the master and slave plungers should
extend together.
Make sure the mast channels and carriage
extend freely without binding.
3 While the mast is extended, inspect the upright channels for
proper lubrication.
4 With the mast extended, make sure the hoist chains are
under equal tension.
5. Lower the mast and make sure the cylinder sequences
properly. The master and slave plungers should lower first.
then the primary plunger should lower. Make sure the mast
channels and carriage lower freely without binding.
6. Make sure the cylinder hose is not twisted and is traveling
smoothly in the hose guides. Check the hose to be sure it is
not scuffing. Minor adjustments to the hose can be made by
loosening the hose clamp and twisting the hose slightly to
fit in the guides. See Figure 16.
7. Be sure the urethane cushions at the base of the outer and
intermediate channels are not flattened or distorted.
8.
Make sure the carriage stop screws are threaded in Place on
the
Triple Lift Masts.
100 Hour Inspection
After
each 100 hours of lift truck operation, in addition to the
daily inspection:
1.
Inspect and lubricate the full length of each pair of hoist
chains with SAE 30 oil.
CAUTION
Thechains must becoated with a film of lubricant at all times.
2 After the first 100 hours and every 500 hours thereafter,
check both pairs of hoist chains for wear and stretch.
WEAR INSPECTION. Check for:
_ Rust and corrosion
-Cracked side plates. If you find cracked side plates, re
place the chains in pairs.
-Tight joints.
If tight joints are caused by rust or
corrosion, loosen them with oil. If they cannot be
loosened or if tight joints are caused by bent pins or
plates or by peened plate edges, replace the chains
in pairs.
-Protruding or turned pins. Replace the chains in pairs.
-Chain side wear. If pin heads and outside plates show
signs of wear, check for misalignment of sheaves,
anchors, or other components. Correct the mis-
alignment.
-Worn, broken, or misaligned chain anchors. Replace
or adjust as required.
If inspection indicates the chains should be replaced, perform
a complete overhaul of the mast as outlined in the service
manual. (Triple-Lift: form 5140; Quad Lift: form 5213)
10