2019 17 D4OPTRS
PROBLEM
Extreme heat; unusual
noise from pump; poor
pump performance
CAUSE
Clogged lines; fi lter
Dirty hydraulic oil
Low oil level
Worn hydraulic pump
Lose belt
SOLUTION
Remove fi lter and check for
clogging. Check lines.
Drain oil reservoir and fl ush.
Replace oil and fi lter.
Check reservoir; fi ll as needed.
Replace.
Tighten
TROUBLESHOOTER’S GUIDE
PROBLEM
Dump hatch will not open
but hopper raises
CAUSE
Dump hatch seal stuck to
opening
SOLUTION
Raise hopper until travel
is stopped and continue
to hold toggle switch
in UP position. Dump
hatch should open due
to increase in system
pressure. If not, have
assistant pry door open.
WARNINGS:
Never work under or around Model DST-4 hopper without fi rst shifting safety prop
under its socket and securing in position with pin.
Never check for hydraulic leaks using bare hand as pressure in system could
cause oil to be injected into the skin; thus causing serious injury.
Do not work on or around sweeper when auxiliary engine is running. Use caution
when performing troubleshooting tests that require auxiliary engine to be running.
!
HYDRAULIC SYSTEM
FUNCTION
The Model DST-4 Hydraulic Pump constantly circulates hydraulic oil through the system
while the auxiliary engine is in operation, thus supplying controlled fl ow and pressure upon
demand. When a hydraulic component control switch is activated, it transmits a signal to the
control valve to divert hydraulic energy to the selected work station.
NOTE: The hydraulic system reservoir capacity is 12.5 gallons and requires ISO 46
grade hydraulic oil (See end of section for oil spec).
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