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American-Lincoln Technology
ATS 46/53 Troubleshooting Guide
Preliminary inspection is recommended prior to troubleshooting ATS 46/53 Sweeper/Scrubber hydraulic
systems. The inspection should include the following: reservoir oil level, engine speed at high throttle, broom
patterns, obvious oil leaks and hose connections.
TROUBLESHOOTING TABLE
PROBLEM
PROBABLE CAUSE
REMEDY
Main broom slow or will
not turn
1. Dump door closed
2. Hopper switch damaged
3. Side broom or main broom obstructed
4. Low engine speed
5. Damaged auxiliary pump
6. Damaged flow divider cartridge
7. Damaged relief valve
8. Damaged solenoid valve
9. Damaged vacuum motor
10. Damaged scrum motor
11. Damaged main broom motor
1. Open dump door. (See "Dump Door
Drifting Closed")
2. Inspect hopper switch located on the
rear of the hopper for continuity and
adjustment. Adjust, repair or replace.
3. Remove obstruction.
4. Adjust engine governor to proper speed
setting
5. Measure the auxiliary pump output with
a flow meter at high throttle. If the output
flow is 0.5 GPM or below the normal
minimum operating flow, replace or
repair pump.
6. Measure side broom speed with a photo-
tach. If the speed is 10 rpm above the
maximum normal operating speed,
replace the cartridge.
7. Inspect main manifold relief cartridge
(RV1) O-rings for damage and replace
O-rings as required. Hold the dump door
lever in the open position and measure
the pressure at the auxiliary pump. The
gauge should read 2600 ± 100 PSI. If
the gauge reads less that 2400 PSI,
reset or replace the relief valve.
8. Inspect the solenoid valve (SV1) cartridge
O-rings in the main manifold for damage
and replace the O-rings as required. Also
inspect the cartridge for signs of
contamination and replaced as required.
9. Measure auxiliary pump pressure at the
pump with the main broom on and in
float. If the gauge reads above 2000 PSI
inspect the scrub motors for seizure
and repair or replace as required.
10.
11.
Measure auxiliary pump pressure at the
pump with the main broom on and in
normal scrub on. If the gauge reads
above 2000 PSI, inspect the scrub motor
for seizure and replace or repair.
Repair or replace motor.
Side broom slow
1. Damaged flow divider cartridge
2. Damaged solenoid valve
3. Damaged side broom motor
1. Measure the flow leaving the port "P1"
of the main manifold valve with a flow
meter. If the flow is below 0.65 gpm,
replace the cartridge (FR1).
2. Inspect the side broom solenoid valve
(SV1).cartridge O-rings in the cylinder
control manifold for damage and replace
the O-rings as required. Also inspect
the cartridge for signs of contamina-
tion and replace the cartridge as needed
3. Repair or replace the motor
