APRON WILL NOT RAISE - Continued
Check which apron cylinder fails to retract.
Does either one or both apron cylinders fail to retract?
YES - Go to Step (7).
NO - Verify problem with operator.
Perform apron cylinders oil flow test.
Have suitable container ready to catch oil.
Extend apron cylinders (Figure 9, Item 1) fully.
Relieve hydraulic pressure by moving APRON CONTROL lever UP and DOWN several times, and
disconnect left and right APRON CYL-#19 hoses (Figure 9, Item 2) from apron cylinders
(Figure 9, Item 1).
Hold open end of each hose (Figure 9, Item 2) in a bucket.
If there is no flow from one of the APRON CYL-#19 hoses, the blockage is between
cylinder end of that hose and circuit 19 tee on the hull floor. If no flow from either hose
is observed, the blockage is in CONT VLV-#19 hose between circuit 19 control valve
and tee on hull floor.
Have assistant start engine and slowly move APRON CONTROL lever to UP position.
Observe oil flow from both APRON CYL-#19 hoses.
Stop engine; relieve hydraulic pressure.
Reconnect left and right APRON CYL-#19 hoses (Figure 9, Item 2) to cylinders (Figure 9, Item 1).