Section 5 - Troubleshooting
HV-18 revised 11/18 SCHWARZE HYPERVAC 69
5.5 Troubleshooting the Side Brooms
Problem Possible Cause Remedy
Broom Disc Spins Too Slow Sweeper engine speed too low Increase sweeper engine speed
Broom speed too low Adjust broom speed
Fluid viscosity is too high for operating
temperature
Replace with lighter weight oil
Outside temperature too low Run auxiliary engine longer before use
Broom hydraulic motor is bad Rebuild or replace motor
Too much down pressure Adjust down pressure
Debris Trails Between Broom
Disc & Pickup Head
Improper broom tilt adjustment Adjust broom tilt
Broom arm with GEO extended too far Adjust GEO
Broom bristles worn Replace broom bristles
Broom Disc Stalls in Heavy
Debris
Pressure to broom motor too low Adjust relief pressure
Sweeper engine speed too low Increase sweeper engine speed to speed up
broom (see section 4 - Operations)
Motor or pump seal leaking Seek service
Too much down pressure Adjust down pressure (see section 4 -
Operations)
Broom Flings Debris Back
Into Gutter
Broom disc tilt angle adjusted too at Adjust broom disc tilt angle
Broom Flings Debris Across
Street
Tilt angle of broom head too great Adjust broom head
Center ap worn or damaged Replace ap
Broom Spins But Will Not
Extend/Retract
Air pressure too low Adjust GEO
Regulator malfunctioning Check directional valve. Replace if needed.
P.O. malfunctioning Check P.O. Replace if needed.
Broom Operates But Will Not
Lift
Bad regulator connection Check wiring.
Block solenoid valve Replace valve
Leaking cylinder seals (uid loss out of port) Replace seals
Mechanical bind Check broom hardware for binds
Broom Spins But Will Not
Lower
P.O. malfunctioning Check P.O. Replace if needed.
Mechanical bind Check broom hardware for binds
Broom Raises But Leaks
Down Immediately
P.O. malfunctioning Check P.O. Replace if needed
Leaking cylinder seals (uid loss out of port
vent)
Replace seals
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