Advance acoustic 56514925, Service Manual

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Sweep System, Main Broom 234 Service Manual – Advance 7765 / Nilfisk CR1500
Troubleshooting
Problem Cause Correction
Main broom motor
not running.
Circuit breaker CB6 is
tripped.
Reset the circuit breaker.
No voltage to the Main
Broom Solenoid (2) valve.
• Check for continuity through the hopper and
hopper door “whisker” switches when the hopper
is down and the hopper door is closed. Repair the
wiring or replace the switch(es) as necessary.
• Check the Main Broom Switch function and repair/
replace as necessary.
• Check the wiring from the Main Broom Switch to
the Main Broom Solenoid (2) valve. There should
be 0 volts to the solenoid when the main broom
and dust control motors are off, and 12 VDC to the
solenoid when the motors are on.
Main Broom Solenoid (2)
valve not operating correctly.
1. Check the solenoid coil resistance. If not 7.2
ohms ±10%, replace the coil. Also see the Main
Broom Sweep System Wiring Diagram .
2. If the coil resistance is within spec, check for
binding or a mechanical problem. Repair or
replace the solenoid valve as necessary.
Specifications
Component Specifications
Hydraulic Broom Drive Motor Displacement – 4.5 CIR
Main Broom Solenoid (2) Valve
Voltage – 12 volts
Nominal Coil Resistance – 7.2 Ohms
Initial current draw – 1.67 amps