Rosco RB48, Assembly, Operation, Service & Parts Manual

Page: 54 / 174

ROSCO - A LeeBoy Company Troubleshooting 5.4
RB48 BROOM
Problem
Cause Solution
Hydrostatic pump is malfunctioning
Operating engine at high altitude
Air intake piping restricted
Air cleaner element dirty
Fuel suction line or filter restricted
Fuel return system restricted
Fuel quality poor
Fuel transfer pump malfunctioning
Throttle improperly adjusted
Injector malfunctioning
Low hydraulic fluid level.
Hydraulic reservoir return filters
contain contamination.
Hydraulic pump priority relief valve
set incorrectly.
Worn hydraulic pump.
Worn steering orbitrol motor.
Worn steering cylinder
Repair/Replace pump
De-rate engine power output for
altitudes above 1000 feet
Remove restrictions.
Clean/Replace air cleaner elements
Check fuel line for restrictions.
Replace fuel filter element(s)
Check/Correct restricted fuel return
system
Verify by operating with a known fuel
quality
Check/Replace fuel transfer pump.
See Engine manual.
Check/Adjust throttle controls
Check/Replace injector. See Engine
manual
Add fluid to proper level. See
Maintenance Section.
Check return filter(s) for contamination
and replace if necessary. See
Maintenance Section.
Check relief valve setting. It should be
set at 1500 PSI. Adjust setting if
necessary. See Maintenance
Section.
Check for worn pump and repair or
replace if necessary.
Check for worn steering orbitrol motor
and repair or replace if necessary.
Repair or replace steering cylinder.
Engine Power Output Low
Steering Is Difficult
Unit Jerks When Operating In
Forward or Reverse