FOLDING STAIRWAY
LeTourneau L1850 Wheel Loader
Rear Mounted Stair
Section 1 Installation and Mounting Instructions (cont.)
Pg. 7
PSA-L-1850 -FS-RF 12-12-14
WARNING
Raising the POWER STEP platform by external means can create a vacuum in the
hydraulic cylinder and create the opportunity to allow air into the hydraulic system,
defeating the inherent safety features of the POWER STEP.
This must be avoided, to maintain safe operation of the POWER STEP.
In instances where the use of external means to raise the platform must be used,
please follow the following instructions:
Loosen hard plumbed hydraulic lines on cylinder side of lock valve on cylinder.
Raise platform by available means.
Note: Make necessary arrangements to collect displaced oil, and be aware that air enters
the piston side of the cylinder as platform is raised.
Lock in raised position.
Re-tighten hydraulic fittings.
SECURE THE PLATFORM IN THE RAISED POSITION, MECHANICALLY, CHAIN &
TAGOUT THE POWER STEP
To recommission the POWER STEP:
Loosen hydraulic fittings on cylinder side of lock valve.
Note: Collect displaced oil.
Lower platform to lowest position, using alternate safety approved means, fully retracting
cylinder. Ensure all personnel are clear of step radius.
Operate electrical control switch to purge air from the hydraulic line systems, lock valve
and cylinder.
Tighten the hydraulic fittings either side of lock valves to restriction fittings.
Cycle step unloaded several times to purge all air from hydraulic system.
The Power Step will not operate correctly if there is any air in the hydraulic circuit (due to
the incorrect operation of the lock valve).
NOTE.
THE RELIEF PRESSURE OF THE POWERPACK IS TO BE SET TO 2800PSI.
IF THE POWERPACK IS REPLACED,THIS RELIEF PRESSURE WILL NEED TO BE
RESET USING INLINE GAUGES.
FAILURE TO DO SO MAY RESULT IN ACCIDENT OR INJURY.
