Sakai SW800 Series, Shop Manual

Page: 39 / 159

2-025
Description and Operation of Hydraulic System
2-3-5. Description and operation of propulsion system
♦
See the hydraulic circuit on page 2-024.
Description of propulsion system
• Made up of propulsion pump (3), front
propulsion motor (8), front drum (10), rear
propulsion motor (7) and rear drum (9).
Brake release solenoid valve (11) is mount-
ed on the chassis.
Basic function of propulsion pump and
propulsion motor
• Propulsion pump
A piston pump is used which selects forward
travel, neutral and backing by varying the
swashplate inclination, and thus varying the
piston stroke. The travel speed is infinitely
variable by the operation of the F-R
(forward-reverse) lever.
• Propulsion motor
A fixed displacement piston motor (piston
stroke is not variable) is used.