TM 5-3805-281-24-1
Theory of Operation
PILOT CONTROLLER OPERATION--METERING AND FULL STROKE
E LEVER
J
E
B
F SLEEVE
PLUNGER D
K
I
G BALANCE SPRING
SPRING C
H RETURN SPRING
GUIDE
I TO RESERVOIR
J TO CONTROL VALVE
SPOOL B
L PILOT OIL
K FROM PILOT PUMP
I TO RESERVOIR
M RETURN OIL
PISTON A
N PILOT CONTROLLER METERING
T7350CK
9025
05
by the plunger. As the lever is moved further, the
To meter a function, the lever (E) is moved slightly.
7
plunger applies more force to the balance spring and
This moves the plunger (D) and spring guide (C)
the pressure to control valve pilot cap again increases
against the balance spring (G) which moves the spool
to balance the spool.
(B) down. The spool blocks the hydraulic oil tank
(reservoir) passage (I) and opens the passage from
When the lever (E) is moved to full stroke, the plunger
the pilot pump (K) to control valve (J) pilot cap.
(D) movement is transmitted directly to the spool (B).
This forces the spool down connecting the passage
Pilot oil (L) also acts on piston (A) in the spool, moving
from pilot pump (K) with the passage to the control
the spool up against the balance spring which closes
valve (J) pilot cap. Oil pressure to the control valve
the passage to the control valve pilot cap. This
pilot cap now equals pilot circuit pressure.
maintains pressure in the control valve pilot cap
passage according to the force on the balance spring
TX,9025,GG2286 1917NOV971/1
