FOLDING LADDER
Caterpillar D10R Dozer
Section 1 Installation and Mounting Instructions (cont.)
Maintenance Notes
Pg9
PSA-D10R FL+RHW 31-3-14
WARNING
Raising the POWER STEP ladder 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 ladder must be used, please
follow the following instructions:
Loosen hard plumbed hydraulic lines on cylinder side of lock valve on cylinder.
Raise ladder by available means.
Note: Make necessary arrangements to collect displaced oil, and be aware that air enters
the piston side of the cylinder as ladder is raised.
Lock in raised position.
Re-tighten hydraulic fittings.
SECURE THE LADDER 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 ladder 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 valve to restriction fitting.
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
Follow all on-site/Mine lifting and safety procedures when installing
Power Step Ladder System to the Dozer.
