John Deere


Issue A9

Compact Utility Tractor with Gear Transmission

790 Serial No. (190064 - )


Safety Signs



Replacement Parts

Service Machine Safely

Service Intervals

Service Engine

Service Transmission

Service Electrical

Cleaning or Replacing Battery

Checking Battery Electrolyte Level

Charging the Battery

Charging Rates

Using Booster Battery

Replacing Fuses

Replacing Headlight Bulb

Replacing Taillight Bulb

Replacing Warning Light Bulb

Replacing Instrument Panel Light Bulb

Adjusting Head Lights

Service Miscellaneous


Storing Machine




John Deere Service Literature

John Deere Quality Statement

All Manuals Close Window

Service Electrical

Cleaning or Replacing Battery


c CAUTION: Avoid injury! Battery gas can explode, to avoid injury:

- Keep sparks and flames away from batteries. Use a flashlight to check battery electrolyte level.

- Never check battery charge by placing a metal object across the posts. Use a voltmeter or hydrometer.

- Always remove grounded (-) battery clamp first and replace it last.

1. Pull out on grille and disconnect two springs (A) to remove grille. Open hood.



2. Loosen nuts (B) on hold-down bolts to remove hold-down. Remove hold-down.

3. Remove negative (black) cable clamp (C) from the battery.

4. Remove positive (red) cable clamp (D) from the battery.

5. If battery is very dirty, remove battery hold down (B), and clean battery case, terminals, cable ends, hold-down, and tray with a solution of 1 part baking soda to 4 parts water. Keep solution out of battery cells.

6. Rinse all parts with clean water. Let dry.

NOTE: If a new battery is required, install a replacement John Deere battery or an equivalent. (See your John Deere dealer.)

7. Install battery.

8. Connect positive (red) cable (D) to battery first, then the negative (black) cable (C).

9. Apply petroleum jelly on battery terminals to help prevent corrosion.

10. Install battery hold-down retainer and tighten hardware.

11. Install grille.

12. Lower hood.

Checking Battery Electrolyte Level


c CAUTION: Avoid injury! Sulfuric acid in battery electrolyte is poisonous. It is strong enough to burn skin, eat holes in clothing, and cause blindness if splashed into eyes.

- Wear eye protection and avoid spilling or dripping electrolyte.

- Flush eyes with water for 15-30 minutes if acid is splashed into eyes.

- If acid is swallowed, get medical attention immediately.

1. Pull out on grille and disconnect the two springs (A) to remove grille. Open hood.


2. Remove cell caps (B).


IMPORTANT: Avoid damage! DO NOT fill cells to the bottom of the filler neck (C). Electrolyte can overflow when battery is charged and cause damage.

3. Electrolyte (D) should be 6 mm (1/4 in.) above plates (E).


4. Add distilled water if necessary.

5. Install cell caps.

Charging the Battery

Follow instructions on the battery charger or in the charger operator's manual, or use the instructions below as a guide.



c CAUTION: Avoid injury! BE VERY CAREFUL: Battery fluid (electrolyte), is a solution of water and sulfuric acid. It is very harmful to eyes, skin, or clothing.

- Wear goggles or an eye shield when you work with a battery.

- If the acid contacts your eyes, skin, or clothing, flush the area immediately with water. Get medical help, if necessary.

A battery gives off gas which can explode. An exploding battery will spray sulfuric acid in all directions.

- Keep cigarettes, sparks, and flames away from the battery.

- Charge the battery in an area with good ventilation.

- DO NOT charge a frozen battery.

Before you charge a battery:

Wait until the battery has warmed to room temperature. Do not charge a frozen battery.

Check the electrolyte level of each cell. (See Checking Battery Electrolyte Level in this section.)

Install the battery cap(s) on the battery.

Turn OFF and unplug the charger before you connect cables to the battery or disconnect cables from the battery.

If the battery becomes warm to touch during charging:

Reduce the charging rate OR

Stop charging the battery until it cools.

Keep battery fully charged.

Remove and clean battery. (See Cleaning Or Replacing Battery in this section.)

Check electrolyte level. (See Checking Battery Electrolyte Level in this section.)

c CAUTION: Avoid injury! To avoid injury, before you connect or disconnect charger cables to battery, unplug charger cord.

1. Connect positive (+) charger cable to positive (+) battery terminal.


2. Connect negative (-) charger cable to negative (-) battery terminal.

3. Plug in charger cord.

4. Charge battery. See CHARGING RATES below.

5. Unplug charger cord. Remove charger cables.

6. Install battery.

Charging Rates

See your battery charger or charger operator's manual for information on charging. Or read the information below to fully charge your battery.


Adjust control to 10 amps.

Charge the battery for 6-8 hours.

For a charger with a switch for MAINTENANCE FREE, DEEP CYCLE, or NORMAL (CONVENTIONAL) setting:


For a charger with SLOW CHARGE, FAST CHARGE, or BOOST CHARGE setting:

DO NOT use the BOOST CHARGE setting.

Use the SLOW CHARGE setting:

For a charger rated at less than 10 amps.

For 3 to 16 hours.

Use the FAST CHARGE setting:

For a charger rated at 10 amps.

For 5 to 8 hours.

NOTE: Your charger may have an AUTOMATIC STOP to prevent charging the battery when the battery is fully charged OR is not in condition to take a charge.

Using Booster Battery


c CAUTION: Avoid injury! Battery gas is explosive:

- DO NOT smoke while you charge battery.

- Keep all flames and sparks away.

- DO NOT charge frozen battery.

- DO NOT connect booster battery negative (-) cable to starting vehicle negative (-) terminal.

1. Connect positive (+) booster cable to booster battery positive (+) post (A).


2. Connect the other end of positive (+) booster cable to vehicle battery positive (+) post (B).

3. Connect negative (-) booster cable to booster battery negative (-) post (C).

4. Connect the other end of negative (-) booster cable (D) to engine ground away from battery.

Replacing Fuses

IMPORTANT: Avoid damage! When replacing fuses - use the proper replacement fuse or damage to the circuit may occur.

1. Turn key switch to OFF position. Open hood and remove left side engine panel (A).


2. Pull cover (B) off fuse holder.


3. Fuse Identification:

15 Amp Fuse (C)-1st position-Headlights


5 Amp Fuse (D)-2nd position- Taillight Switch
15 Amp Fuse (E)-3rd position-Warning Lights
10 Amp Fuse (F)-4th position-Flood Lights
3 Amp Fuse (G)-6th position-Seat Switch
3 Amp Fuse (H)-7th position-Control Box
10 Amp Fuse (I)-8th position-Indicator
10 Amp Fuse (J) - 11th position - Spare
15 Amp Fuse (K) - 12th position - Spare

4. Pull defective fuse from socket.

5. Push new fuse into socket.

6. Install fuse holder cover.

7. Install left side engine panel. Lower hood.

Replacing Headlight Bulb

IMPORTANT: Avoid damage! Prevent premature failure when inspecting or replacing the headlight bulb assembly. Refrain from touching the assembly glass component with bare skin.

1. Raise hood and latch open.

2. Disconnect wiring harness (A) from headlight bulb connector (B).


3. Pull back rubber protector (C) from assembly. Rotate headlight bulb assembly (D) left 1/3 turn and remove from headlight housing socket.


4. Install new headlight bulb assembly into housing socket and rotate right 1/3 turn into a locked position.

5. Replace rubber protector (C).

6. Connect wiring harness to headlight bulb connector.

7. Check lights. (See Using Light Switch in the Operating section.)

8. Lower hood.

Replacing Taillight Bulb

NOTE: Taillight can be serviced by removing the rear assembly lens.

1. Remove two screws (A) and lens from the taillight assembly.


2. Pull bulb (B) to remove. DO NOT twist.


3. Push new bulb into socket.

4. Check lights. (See Using Light Switch in the Operating section.)

5. Install lens.

Replacing Warning Light Bulb

1. Remove three screws (A) and lens (B) from the warning light assembly.


2. Push down and rotate bulb (C) to remove.


3. Install new bulb.

4. Check lights. (See Using Light Switch in the Operating section.)

5. Install lens.

Replacing Instrument Panel Light Bulb

1. Open hood.

2. Remove five screws (A) from console panel below instrument panel.

3. Remove six instrument panel screws (B).



4. Carefully raise instrument panel (C).


5. Identify defective bulb location and remove bulb holder (D) from instrument panel socket.

6. Pull defective bulb from socket. DO NOT twist.

7. Push new bulb (E) into socket.

8. Install bulb holder into instrument panel.

9. Check lights. (See Using Light Switch in the Operating section.)

10. Install instrument panel.

Adjusting Head Lights


1. Park tractor on a level surface at least 15 ft. away from a flat vertical surface.

2. Turn on head lights.

3. Turn head light screw (A) to adjust light beam up or down.