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FIGURE 2: Chocking Procedures TZ
1. Raise the empty lift to its maximum height.
2. Using only the safety chock pin provided, insert the
pin in the hole in the pivot block.
3. Be sure the pin extends through the block 1/2''
beyond the pivot block.
C. TROUBLESHOOTING MAINTENANCE:
All servicing should be done by qualified personnel
who have read and understand all of the information
provided in the Operating, Installation and Mainte-
nance sections of this manual.
LIFT WILL NOT MOVE
1. Lift will not raise or tilt:
a. Check the power switch, fuses, overloads and
breaker.
b. Check the voltage at motor; motor may have failed.
2. Operational noises, erratic or noisy performance.
a. Lift may be overloaded or jammed. Check load
weights and obstructions (see nameplate for
capapcity).
b. Motor (3 phase) single phasing. Check voltage at
motor terminals.
c. Motor (3 phase) reversed.
d. Motor (1 phase) low voltage. Check voltage at
motor terminal.
e. Oil shortage: Reservoir low or oil line failure.
Repair or replace.
f. Down valve open: check wiring for damage.
Remove and replace if necessary.
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PRESTO OWNER'S MANUAL: XZ, XZT FLOOR LEVEL LIFTS & TZ FLOOR LEVEL TILTS
3. Motor overheats:
a. Excessive cycle rates (15 cycles per hour max.)
Check actual time in use.
b. Low voltage: Check voltage at motors.
c. Oil starvation: Check filter in reservoir.
LIFT OPERATING SLOWLY
1. Up cycle:
a. Oil starvation: Check filter in reservoir. Check for
pinched hydraulic lines.
b. Oil viscosity: Oil is too heavy or too thin.
c. Air in cylinder: Cycle lift with no load, 2 or 3
times and depress the "up" switch for 5 seconds
after reaching maximum height on each cycle.
2. Down Cycle:
a. Down solenoid valve filter dirty: Remove and
clean.
b. Check oil condition: Replace if dirty.
c. Oil viscosity is too heavy: Replace.
3. Lift raises, then slowly lowers without power:
a. Leaking hydraulic lines or fittings: Check for tell-
tale oil spots.
b. Pump check valve in pump may be inoperative:
Pump must be replaced.
4. Lift will not lower when energized:
a. Down solenoid faulty: Check voltage; may be low
or wrong voltage for coil or coil may be wrong
voltage for secondary voltage.
b. Check continuity of coil: Could be burned out.
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