MAINTENANCE
2-2
Page 2
TESCO EQUIPMENT LLC
ML50-30 MAINTENANCE LIFT
CAUTION
WHENEVER AN ADJUSTABLE HYDRAULIC RELIEF VALVE OR PRESSURE REDUCING VALVE
IS REPLACED, REDUCE THE PRESSURE SETTING PRIOR TO STARTING THE UNIT. ADJUST
THE REPLACED COMPONENT TO SPECIFICATION AS OUTLINED IN THE ADJUSTMENT
PROCEDURES.
CAUTION
WHEN MAKING HYDRAULIC SYSTEM ADJUSTMENTS, THE HYDRAULIC OIL MUST BE AT
NORMAL OPERATING TEMPERATURE.
1.
HYDRAULIC ADJUSTMENTS - HYDRAULIC POWER MODULE
ITEM
FUNCTION
SETTING
PROCEDURE
A
Pressure Gauge
N/A
Used for reading system pressures.
B
Lift Down Speed
Control
90 sec
+/- 10
Raise lift fully. Activate lift down function and record
the time it takes the lift to lower fully (not including
stabilizer retract). Adjust valve to increase/
decrease lift lower speed. Loosen locknut and turn
valve clockwise to slow lift speed, counter-
clockwise to increase lift speed. Tighten locknut
when adjustment is complete.
C
Main Relief
1800 psi
+/- 25
With the engine running, extend the stabilizers to
the maximum and hold control in “Extend”. Read
the pressure at the gauge. To adjust the pressure,
loosen the locknut on valve. Turn valve clockwise
to increase pressure, counter-clockwise to lower
pressure. Tighten locknut when pressure is set.
D
Stabilizer Speed
Control
(Left Rear Stab.)
N/A
Make certain that left rear stabilizer is last to fully
extend and last to fully retract. Loosen locknut and
turn valve clockwise to slow stabilizer speed,
counter-clockwise to increase stabilizer speed.
Tighten locknut when adjustment is complete.
E
Port Relief
1,200 psi
+/- 25
Energize lift down function, read pressure at
gauge. Turn valve clockwise to increase pressure,
counter-clockwise to lower pressure.
Mar. 17
Property of American Airlines
