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The MD105 utilizes two Honda iGX800 gasoline engines
(Figure 12). Each engine assembly is equipped with the
following components:
1. Fuel Filter — Filters gasoline fuel contaminants.
2. Oil Cooler — Maintains the optimal lubricating oil
operating temperature.
3. Air Cleaner — Prevents dirt and debris from entering
the engine cylinders.
4. Oil Filler Port — Remove the cap to add fresh oil as
specified in Table 3.
5. Spark Plugs (2) — Provide spark to the ignition
system. Set the spark plug gap to 0.028–0.031 in.
(0.7–0.8 mm).
6. Exhaust Manifold — Collects the exhaust gases from
the engine cylinders into one exhaust pipe.
7. Oil Dipstick — Remove to check the amount and
condition of oil in the crankcase.
PAGE 24 — MD105 RIDE-ON TROWEL • OPERATION MANUAL — REV. #0 (03/29/24)
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Figure 12. Dual Honda iGX800 Engine Assembly
COMPONENTS ( ENGINE )
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8. Cooling Fan — Assists the oil cooler in regulating the
oil temperature.
9. Oil Filter — Filters engine oil contaminants.
10. Oil Drain Bolts (2) — Remove either drain bolt to drain
engine oil from the crankcase.
11. Regulator Rectifier — Converts AC from the charge
coil into DC for battery charging and limits the output
when the battery is fully charged.
12. Hydraulic Pump — Variable displacement, axial-piston
pumps drive the hydraulic motors that rotate the blades.
13. Engine Mount — Mounts with rubber isolators secure
the engine/pump assemblies to the trowel frame.
14. Starter — Starts the engine when the ignition key is
rotated to the START position.
15. Engine Control Unit (ECU) — Communicates with
engine sensors and actuators to ensure optimal engine
performance.
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