PREPARATION FOR USE - CONTINUED
Lowering Empty Dolly Set to Ground - Continued
Serious damage to dolly set can result if only one strut
knee joint is locked straight and lowering operation is
continued. Lowering operation should be stopped
immediately if strut knee joint remains locked straight.
Raise dolly set and again try lowering.
Slowly, in unison (all four crewmen), open the hydraulic pump valves by turning handles (1) counterclockwise
to the REL (Release) position. This will lower all cylinders in unison ensuring that the strut knee joint (4) is
bending and is not locked straight.
Check for obstructions that could prevent strut knee joints from bending.
Ensure that strut knee joints (4) are bending. Stop operation immediately if strut knee joints are not bending
and are locked straight. Raise immediately and try again.
Lower all four sides of dolly set to ground in unison, ensuring that adapter arms(7) remain vertical (not tilted)
while lowering dolly set until contact is made with the ground. Tilted adapter arms means that one side is
lowering faster or lower than the others. However, to correct this condition, open the valves on the pumps of
the tilted adapter and close the valves on the other. Activate hydraulic pumps until adapters are in a vertical
Reduce pressure in all four air springs (8) to 10 PSI after contact is made with the ground