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4. MAINTENANCE
positive and negative to ground. Always use 12-volt
booster battery for 12-volt electrical systems.
1. Connect booster battery or batteries to
produce the required system voltage for your
engine application.
NOTE: To avoid sparks, DO NOT allow the free ends
of jumper cables to touch the engine.
2. Connect one end of jumper cable to the POSITIVE
(+) post of the booster battery.
3. Connect one end of jumper cable to the POSITIVE
(+) post of the battery connected to starter.
4. Connect one end of the other jumper cable to the
NEGATIVE (-) post of the booster battery.
5. ALWAYS complete the hook-up by making the last
connection of the NEGATIVE (-) cable to a good
ground on the engine frame and away from the
battery(ies).
6. Start the engine. Disconnect jumper cables
immediately after engine starts. Disconnect
NEGATIVE (-) cable first.
4.16 ENGINE CRANKCASE VENT TUBE
Remove and clean every 600 hours or 12 months. If
you operate the engine in dusty conditions, clean the
tube at shorter intervals.
1. Remove and clean crankcase vent tube.
2. Install the vent tube. Be sure the O-ring fits
correctly in the rocker arm cover for elbow adapter.
Tighten hose clamp securely.
4.17 ENGINE VALVE CLEARANCE
Check/adjust at 900 hours then every 1200 hours or 24
months. See authorized engine service dealer or refer
to Engine Manual for procedures.
4.18 EMISSION REGULATION/ENGINE RPM
Do not adjust operating speed. Full speed is factory set
at 2500 rpm.
Do not adjust idle speed above 1400 rpm. Proper idle
rpm is 1200 + 100.
Do not alter injection pumps.
TAMPERING with the following engine factory
settings is ILLEGAL except to reset to published
specifications and reseal by authorized engine
dealer:
- Engine Timing
- Fuel Delivery
- Aneroid Settings
- Rated Speed
Deere will reissue emissions dataplates only to replace
damaged plates. Requests must be in writing and
include name, address, engine model, and serial
number with reason for need.
Power rating changes WILL NOT be allowed on new
engines.
4.19 FUEL INJECTORS
ESCAPING FLUID UNDER PRESSURE CAN
PENETRATE THE SKIN CAUSING SERIOUS
INJURY. RELIEVE PRESSURE BEFORE
DISCONNECTING FUEL OR OTHER LINES.
TIGHTEN ALL CONNECTIONS BEFORE
APPLYING PRESSURE. KEEP HANDS AND BODY
AWAY FROM PINHOLES AND NOZZLES THAT
EJECT FLUIDS UNDER HIGH PRESSURE. USE
A PIECE OF CARDBOARD OR PAPER TO
SEARCH FOR LEAKS. DO NOT USE YOUR
HAND.
IF ANY FLUID IS INJECTED INTO THE SKIN, A
DOCTOR FAMILIAR WITH THIS TYPE INJURY
MUST SURGICALLY REMOVE IT WITHIN A
FEW HOURS OR GANGRENE MAY RESULT.
DOCTORS UNFAMILIAR WITH THIS TYPE OF
INJURY MAY CALL THE DEERE & COMPANY
MEDICAL DEPARTMENT IN MOLINE, ILLINOIS,
OR OTHER KNOWLEDGEABLE MEDICAL
SOURCE.
IMPORTANT: Always use John Deere replacement
parts meeting John Deere performance
WARNING