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.High-pressure washing system pump (*)

80.Flow regulator (*)

81.Hydraulic system oil fi ller plug

82.Hydraulic system oil level indicator

(*) Optional for some countries.

RS 501

33015500(3)2008-02

99

Page 101
Image 101
Nilfisk-Advance America RS 501 service manual Hydraulic System, Component Location