JLG 600SC_660SJC Service Manual User Manual
Page 101
SECTION 5 - CAT CHASSIS (S/N 0300128000 TO PRESENT)
3121157
– JLG Lift –
5-9
If exertion of pilot pressure for changeover is stopped, the
2-speed changeover valve is changed as in the figure. The
2-speed control piston chamber is connected to drain in
the motor case. The swash plate is pushed by the result-
ant of thrust of piston sub assembly and spring force, and
is settled when its side A contacts the flange holder. The
swash plate inclination becomes
a
, obtaining speed one
(low speed) rotation for the motor.
While the engine stops, the swash plate is pushed by
spring force, and its side A contacts the flange holder. The
swash plate inclination becomes
a
, obtaining speed one
(low speed) rotation for the motor.
Figure 5-10. Structure of Two Speed Changeover System at Low Speed