Nilfisk-Advance 56507009, Troubleshooting Manual

Page: 59 / 82

FORM NO. 56043129 - SR 1900 - 59
HYDRAULIC SYSTEM
Hydraulic Truth Table
Electrical Solenoid’s energized Status
Solenoid Functions S1 S2 S3 S4 S5 S6 S7 S8 S9
Hopper Raise (UP) X X
Hopper Lower (DN) X
Dump Door Open X
Dump Door Closed X
Main Broom State ON X X
Main /Side Broom State ON X X X
Dust Control ON Wand State
(**)
X X
Dust Control OFF Bypass (*) X
Side Broom Lower X
Side Broom Raise & turn
OFF side broom motor
0V
No Hydraulic Manifold
Functions
System
overloaded
in relief
S6 not
energized
(***)
Notes:
* Operator sweeping wet debris with the dust control fan (impeller) turned off.
** Operator using vacuum wand option. The dust control fan operates with the machines drive stationary. To vacuum attach the suction hose wand
to the special hopper inlet fitting.
*** The S6 solenoid valve assembly bypasses the sweep system components and sends its hydraulic oil flow to tank when S6 is de-energized (0
volts).
HYDRAULIC MANIFOLD ASSEMBLY COMPONENT LOCATION KEY
Note: the combined electrical solenoid and hydraulic valve cartridge assembly can be serviced separately.
Item # Component Description & Hydraulic Circuit Function
S1 Solenoid coil & valve cartridge, hopper dump door (open), coil 8 Ohms
S2 Solenoid coil & valve cartridge, main broom System, coil 8 Ohms
S3 Solenoid coil & valve cartridge, side broom system, coil 8 Ohms
S4 Solenoid coil & valve cartridge, dust control (wand state), coil 8 Ohms
S5 Solenoid coil & valve cartridge, hopper lift system (raise), coil 8 Ohms
S6 Solenoid coil & valve cartridge, hydraulic circuit on/off (by-pass), 8 Ohms
S7 Solenoid coil & valve cartridge, hopper Dump door (close), coil 8 Ohms
S8 Solenoid coil & valve cartridge, dust control fan off (by-pass), coil 6 Ohms
S9 Solenoid coil & valve cartridge, hopper lift (close), coil 8 Ohms
Notes: (A) The solenoid coils w/connector S1 – S7 & S9 are identical and can be swapped for (T.S.) troubleshooting. (B) The solenoid coil w/
connector S8 is different only one is used. (C)The valve cartridges for S1, S2 & S4 are identical, S3 & S7 the same and S5 & S9 the same and can
be swapped for T.S. (D)The S6 & S8 valve cartridges are different configurations one of each are only used.
Item # Additional Hydraulic Manifold Components Descriptions
X1 Cartridge, side broom lift cylinder piloted 3/2 directional valve
X2 Cartridge, side broom piloted check valve
X3 Orifice (.038 Dia.), hopper raise control
X4 Orifice (.086 Dia.), hopper dump door control
X5 Orifice (.078 Dia.), hopper lower control
X6 Cartridge, broom system flow divider
X7 Cartridge, steering system flow divider
X8 Check valve, side broom(s)
X9 Cartridge, hopper lift free check
X10 Pressure relief valve (2500 PSI.), manifold block