FRONT CORNER (LEFT OR RIGHT) RAISES IN SPRUNG, BUT NOT UNSPRUNG MODE - Continued
Figure 4. Hydraulic Diagnostic Center (HDC) Control Box.
Stop engine and relieve hydraulic pressure.
Is transducer T-3 hydraulic pressure between 3,950-4,050 psi (27,235-27,925 kPa)?
YES - Go to Step (7).
NO - Go to Step (20).
Perform main pump flow test.
As insufficient flow of hydraulic oil is indicated if ejector requires more than 32 seconds
to fully extend or if apron requires more than 15 seconds to fully raise.
Start engine and allow engine to idle (750-850 rpm).
With ejector fully retracted, hold EJECTOR CONTROL lever in FORWARD, and note length of time
required for ejector to fully extend.
With apron in full down position, move APRON CONTROL lever to UP, and note length of time required
for apron to fully raise. Lower apron.
Stop engine; relieve hydraulic pressure.
Does ejector fully extend in less than 32 seconds and apron raise fully in less than 15 seconds?
YES - Go to Step (8).
NO - Go to Step (19).