SERVICE MANUAL
ENGLISH
HYDRAULIC SYSTEM
HYDRAULIC SYSTEM
DESCRIPTION
The hydraulic system consists of three independent circuits, supplied by one tank.
The fi rst circuit is supplied by a variable delivery pump, activated by the diesel engine. This pump activates two drive system motors, which operate on the front wheels.
The forward and reverse drive speed is adjusted by the drive pedal, which is connected to the pump.
The second circuit is supplied by a gear pump, activated by the diesel engine. This pump activates the suction fan motor by means of the control valve assembly.
The third circuit is supplied by a gear pump with priority valve, activated by the diesel engine. This pumps, by means of the control valve assembly, performs the following functions:
–Side broom motor activation
–Hopper lifting and dumping
–Suction inlet lifting and moving
–Rear wheel control hydraulic cylinder activation (by means of the oil taken from the priority valve)
All circuits are protected by suction fi lters and safety valves.
NOTE
The hydraulic system hoses are DIN type.
COMPONENT LOCATION
50.Hydraulic system oil tank
51.Drain fi lter
52.Suction fi lter
53.Suction fi lter
54.Drive system pump
55.Diesel engine
56.Left drive system motor
57.Control valve assembly
58.Right drive system motor
59.Skirt cylinder
60.Hopper lifting cylinder
61.Hand pump
62.Right side broom motor
63.Left side broom motor
64.Hydraulic system oil cooler
65.Parachute valve
66.Suction inlet and broom lifting cylinder
67.Check valve
68.Power steering
69.Flow separator (priority valve)
70.Accessory and steering system pump
71.Suction fan pump
72.Control valve assembly
73.Solenoid valve
74.Suction fan motor
75.Power steering cylinder
76.Drive pedal assist
77.Oil fi lter
78.Drive system pump oil fi lter
79.
80.Flow regulator (*)
81.Hydraulic system oil fi ller plug
82.Hydraulic system oil level indicator
(*) Optional for some countries.
RS 501
99
