4-20. HYDRAULIC SYSTEM FLUSHING (CONT)
Remove hydraulic tank cap (3) from filler neck on hydraulic tank (2).
Insert open end of 75-foot (22.9 m) return hose assembly (4) of Y-hose assembly (5) into filler neck of hydraulic
Using electrical tiedown straps, secure end of return hose assembly (4) into top of hydraulic tank (2) to support
weight of hose and prevent hose from being dropped or pulled away from hydraulic tank.
HYDRAULIC TANK FLUSHING
To avoid damage to equipment, do not attempt to make any adjustments to the
platform, steering, or gooseneck until all hydraulic systems are bled and air is
removed from the system. If adjustments are attempted, air pockets may move
through the system and may cause unexpected movements or premature
Refer to paragraph 4-18, steps 6 thru 11, and drain hydraulic tank with gooseneck and platform set at their existing
Cut and remove electrical tiedown straps used to secure Y-hose return line to hydraulic tank. Remove return hose
from hydraulic tank filler neck and set aside, clear of work area.
Take care not to allow dust, dirt, or other contaminants to enter the open hydraulic
tank or hydraulic fluid may be recontaminated and damage to equipment may
Access hydraulic tank (2) for flushing as follows:
a. Remove six screws (6) and filler neck assembly (7) from access cover (8).
b. Remove six nuts (9), washers (10), access cover (8), and gasket (11) from hydraulic tank (2). Discard gasket.
Lint-free rags used for cleaning should be rotated or turned to prevent
Clean inside of hydraulic tank (2) using lint-free wiping rags. Clean all parts removed using lint-free wiping rags.