5-20 LeeBoy 8520C Conveyor Paver
Maintenance
Selective Catalytic Reduction Selective Catalytic Reduction
(SCR) (SCR)
The SCR system is an efcient, effective means of
ltering dirt and other contaminates for optimum engine
performance while reducing air pollution from exhaust
emissions. The SCR system precisely injects Diesel
Exhaust Fluid (DEF) into the engine’s exhaust system
to transform those toxic exhaust gases into harmless
water vapor and nitrogen. SCR technology is also cost-
effective and fuel-efcient. (Figure 5-21)
NEVER tamper with or remove any
emission-related component under penalty of law.
DEF Pump
DEF Tank
DPF
SCR
Figure 5-21. DEF Tank, Pump and DPF
A sensor on the DEF tank header monitors the uid level,
temperature and quality of DEF in the tank. The header
is mounted on top of the DEF tank and provides ltered
DEF supply from the tank to the DEF injector through the
DPF (Diesel Particulate Filter).
NOTE: Check the ttings around the DEF tank header
for leaks or any signs of damage regularly.
DEF leaks will leave a white deposit around
the ttings.
DO NOT pressure wash or steam
clean this unit to avoid damaging the components.
Use compressed air to remove any loose debris.
Change Oil Separator ElementChange Oil Separator Element
The oil separator captures oil mist carried over from the
lubrication process. The oil separator element must be
changed every 1500 hours of operation. (Figure 5-20)
Cap
O-Ring
Gasket
Element
Oil
Separator
Body
Replace the oil
separator element
every 1500 hours
of operation.
Figure 5-20. Oil Separator
To change the oil separator element:
1. Unscrew the oil separator cover cap and remove
from the body.
2. Remove the used gasket and lter element.
Dispose of in accordance with environmental laws
and requirements.
3. Wipe oil and grease off the oil separator body and
cover.
4. Insert a new lter element and gasket.
5. Reattach the cover cap to the oil separator body.
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