PART C - OPERATION OF THE HYDRAULIC
SYSTEM UNDER EMERGENCY CONDITIONS
Hydraulic Power Loss (Primary Hydraulic Pump Failure).
If the primary hydraulic pump fails, switch to the backup hydraulic pump
using the following procedures, and notify organizational maintenance.
o Pull the hydraulic system selector valve handle out (Fig. 3F).
o Close the backup system
clockwise (Fig. 3F).
Do not allow hand pump pressure to exceed 150 psi. Excessive
pressure will damage hydraulic components.
exceeds 150 psi, IMMEDIATELY open dump valve (by turning
handle counterclockwise) until the reading drops below 150
psi. Then close dump valve by turning handle fully clockwise.
o Manually operate the handle of the manual hydraulic pump until
the hand pump pressure gage indicates pressure is between 125 and
150 psi. This will engage the backup hydraulic pump to the main
engine (Fig. 3F).
o Be sure that the hydraulic ball valve is OPEN before starting
the main engine with the backup pump engaged.
o Serious damage to the hydraulic components will result if you
do not take this action.
o Do not move the vehicle with the backup pump engaged; damage
to the backup pump will result.
engine to exceed 1100 RPM; damage to the backup pump will