PRESTO P4 LEVEL LOADER OWNER’S MANUAL
15
eye. The reflector may need to be cleaned
or replaced.
2. The down valve may be de-energized. While
the platform is lowering, the down valve
should be energized and fully open. Check
the solenoid in the valve with a voltmeter.
The valve must be clean and free to operate.
Remove the solenoid, then the down valve.
Look for dirt or metal chips which could block
the valve action. Clean the valve plunger
with kerosene, then blow it clean with
compressed air. Before reassembly,
depress the plunger manually several times
to be sure it moves freely. The expansion
nut which holds the solenoid should be
finger tight only! If these steps do not solve
the problem, please call the Presto Lifts
Customer Service Department at (800) 343-9322.
Repacking the Cylinder
The lift in the P4 Level Loader unit may use
several different types of cylinders. To order a
repacking kit and receive repacking instructions,
please call the Presto Lifts Parts Department
at (800) 343-9322. When ordering, specify the
model number and serial number of the unit.
Adjusting the Chain Tension
It is very important that the lifting chain be
tensioned correctly. As the chain is used, it will
tend to stretch a bit. Over time, this can cause
it to loosen. The adjustment mechanism is
located on the rear of the unit. See Fig. 7.
1. Lower the platform completely and unplug
the unit. Remove the plate on the rear of the
unit.
2. Loosen the two locking bolts.
3. Find the two tensioning bolts. Loosen the
locknuts so you can turn these bolts.
4. Turn the tensioning bolts in or out to change
the chain tension. The chain tension should
be as tight as possible without lifting the
platform off of the floor. The setting should
be the same on each side of the
mechanism.
5. When the tension is correct, tighten the lock
nuts.
6. Tighten the two locking bolts.
