TM 5-3805-291-23-1
THEORY OF OPERATION - CONTINUED
0003 00
ELECTRO-HYDRAULIC SYSTEM - CONTINUED
c.
TILT BACK Operation.
(1)
When joystick control is moved to TILT BACK position, pilot oil is sent to left end of tilt valve stem
(107), moving it right. Implement pump oil is sent through tilt control valve from pump port (B) around tilt
valve stem to bottom of compensation and load check valve (102). Compensation and load check valve is
pushed up and flow goes through openings in load check valve to bridge passage. Oil flows around tilt
valve stem and through drift reduction solenoid valve (93) to lift cylinder head end work port.
(2)
Oil flows to lift cylinder head end work port to head end of tilt cylinder. This causes bucket to tilt back.
Solenoid valves (95) and tilt valve stem (107) respond in proportion to signal received from operator con-
trols.
(3)
Oil from rod end of tilt cylinder enters through lift cylinder rod end work port and exits to hydraulic tank
through tank port (C).
d.
DUMP Operation.
(1)
When joystick control is moved to DUMP position, pilot oil is sent to right end of tilt valve stem (107),
moving it left. Implement oil is sent from pump port (B) around tilt valve stem to bottom of compensation
and load check valve (102). Compensation and load check valve is pushed up and flow goes through open-
ings in load check valve to bridge passage. Oil flows around tilt valve stem to lift cylinder rod end work
port.
(2)
Oil flows through rod end work port to rod end of tilt cylinder. This causes bucket to dump. Solenoid
valves (95) and tilt valve stem (107) respond in proportion to movement of operator controls.
(3)
Oil from head end of tilt cylinder comes through lift cylinder head end work port, flows through energized
drift reduction solenoid valve (93), and exits through tank port (D) to hydraulic tank.
0003 00-163
