MAYCO LS450 CONCRETE PUMP • OPERATION MANUAL — REV. #2 (02/23/21) — PAGE 29
Figure 8. Hatz 4H50 Diesel Engine Components
The engine (Figure 8) must be checked for proper
lubrication and filled with fuel prior to operation. Refer to the
manufacturer’s engine manual for instructions and details
of operation and servicing.
1. Intake Opening — Captures air needed for internal
combustion.
2. Rain Cap — Prevents precipitation and foreign objects
from entering the exhaust system.
3. Air Filter (Optional) — Helps provide clean source of
air flow to the engine.
4. Dust Discharge Valve — Prevents larger particles
of dust and debris from being drawn back into the air
cleaner and discharges dust and debris to the outside.
5. Lifting Eyes — Located on either side of the engine.
Used when the engine must be lifted for service.
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COMPONENTS (ENGINE)
6. Fan — Draws air through the radiator to cool the
engine.
7. Oil Filter — Spin-on type, filters out oil contaminants.
8. Fuel Fine Filter — Protects the lift pump and diesel
injection systems by cleaning fuel of smaller, harmful
contaminants and water not captured by the filtration
system.
9. Oil Drain Bolt — Remove this bolt to drain the
crankcase of engine oil.
10. Starter — Starts the engine when the ignition key is
rotated to the START position.
11. Electric Fuel Pump — Pumps fuel to the fuel system.
12. Fuel Prefilter Drain Plug — Retains dirty fuel inside
the filter until the fuel prefilter is ready to be changed.
Also acts as the water-in-fuel sensor.
13. Fuel Prefilter — Protects the lift pump and diesel
injection systems by separating and cleaning fuel of any
harmful contaminants and water. Filters fluids before
further filtration by the fuel fine filter.
14. Engine Nameplate — Identifies engine make, model,
serial numbers, and other pertinent information.
15. Dipstick — Remove to check the amount and condition
of oil in the crankcase.
16. Oil Filler Plug (Lower) — Remove this plug to add
fresh oil to the crankcase. Fill with the recommended
type oil as specified in the Maintenance section of
this manual.
17. Crankcase Ventilation — One-way passage for gases
to escape in a controlled manner from the engine
crankcase.