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BBT-JD420
TROUBLESHOOTING
Maintenance Schedule
Engine will not start
Possible cause
Correction
1. Electric starting (applicable
types): Check battery and fuse
Discharged
Recharge battery
Fuse burnt out
Replace fuse
2. Check control positions
Fuel valve OFF
Move lever to ON
Choke OPEN
Move lever to CLOSED unless
engine is warm
Engine switch OFF
Turn engine switch to ON
3. Check fuel
Out of fuel
Refuel
Bad fuel; engine stored without
treating or draining petrol, or
refuelled with bad petrol.
Drain fuel tank and carburettor
Refuel with fresh petrol
4. Remove and inspect spark plug.
Spark plug faulty, fouled, or
improperly gapped
Gap, or replace spark plug
Spark plug wet with fuel (flooded
engine).
Dry and reinstall spark plug. Start
engine with throttle lever in FAST
position.
5. Take engine to an authorized JD
servicing dealer, or refer to shop
manual.
Fuel filter clogged, carburettor
malfunction, ignition malfunction,
valves stuck etc.
Replace or repair faulty
components as necessary.
Engine lacks power
Possible cause
Correction
1. Check air filter
Filter element(s) clogged.
Clean or replace filter elements
2. Check fuel
Bad fuel; engine stored without
treating or draining petrol, or
refuelled with bad petrol.
Drain fuel tank and carburettor
Refuel with fresh petrol.
3. Take engine to an authorized JD
servicing dealer, or refer to shop
manual.
Fuel filter clogged, carburettor
malfunction, ignition malfunction,
valves stuck, etc.
Replace or repair faulty
components as necessary.