THEORY OF OPERATION - CONTINUED
TRANSMISSION - CONTINUED
Machine is equipped with these modu-
(a) Modulating valve for clutch 1 (for-
(b) Modulating valve for clutch 2 (for-
(c) Modulating valve for clutch 3
(d) Modulating valve for clutch 4 (sec-
(e) Modulating valve for clutch 5 (third
(f) Modulating valve for clutch 6 (first
(a) When machine ECM requires a clutch to be disengaged, there is no flow of electric current to sole-
noid. Pump oil flows into valve body from pump passage. Oil then flows into passage, through orifice,
and into chamber. Since there is no signal sent to solenoid, pin cannot hold ball against orifice. Oil
flows through orifice, past ball, to tank passage. Oil in tank passage becomes return oil.
(b) Spring holds valve spool left. When valve spool is shifted left, oil in clutch passage flows to tank pas-
sage. When oil in clutch passage is vented to tank, clutch cannot be engaged. Oil in pump passage is
blocked from entering clutch passage.