Komatsu PC200-8M0, Shop Manual

Page: 213 / 1254

SEN06121-00
PC200, 200LC, 220, 220LC-8M0 10-403
15
403 Hydraulic system, Part 3
Travel motor
Operation of motor
1) At slow speed (motor swash plate angle at maximum)
q As the solenoid valve is de-energized, the pilot
pressurized oil from the self pressure reducing
valve does not flow to port (P).
q Regulator valve (9) is pushed to the right by
spring (10).
q Pressurized oil being conducted from the con-
trol valve to end cover (8) by pressing check
valve (22) is shut off by regulator valve (9).
q Fulcrum (a) of rocker cam (4) is eccentric to
the working point (b) of the combined force of
the propulsion force of cylinder (6).
q The combined force of the piston propulsion
forces works as the moment of inclining rocker
cam (4) toward the maximum swash plate
angle.
q The pressurized oil at regulator piston (15)
passes through orifice (c) of regulator valve (9)
and is drained to the motor case.
q Rocker cam (4) is inclined in the maximum
swash plate angle direction. The motor capac-
ity becomes maximum, turning on the low
speed travel.