JOHN DEERE JD760 (01) PDF Document

1. Check the engine crankcase oil level.

2. Check the radiator coolant level.

3. Check radiator hose and connections for leaks.

4. Make sure the fuel shut-off valve for the fuel tank is open.

5. Visually inspect tractor and tires for any irregularities which might affect operation.

1. Place the Hi-Lo (right-hand) gearshift lever in neutral (N) position.

2. Move hand throttle lever to a position 1/3 of the way forward.

3. Turn key switch to the on position. The oil pressure indicator lamp should light. If it does not, turn the key switch off and determine the cause.

4. At temperatures below 40° F. use the cold-weather starting fluid adapter and other cold weather starting aids as required.

5. Press the starter button to crank the engine. If the engine does not start the first time, wait a minute or two before trying again. If it does not start after four attempts, see Section 250 of this manual.

NOTE: Do not hold the starter button in “crank” position for more than 30 seconds at a time. To do so may overheat the starter.

6. As the engine begins to run, check to see that the oil pressure light goes out. If not, stop the engine and determine the cause.

Check ammeter for alternator charging rate. If no charge is shown, refer to Section 150 of this manual.

1. Make sure that oil pressure light goes out.

2. Be sure ammeter shows charge.

3. Check for water, oil, or hydraulic leaks.

4. Check the transmission hydraulic system oil level.

Starting the engine in cold weather can be facilitated by connecting an additional 24 volts of booster batteries in parallel with the tractor batteries.

Use jumper cables to connect the positive (+) terminal of the booster battery assembly to the positive terminal of the tractor battery assembly. To make the last connection or the first disconnection at some point away from the battery, connect the negative (-) terminal of the booster battery to a good ground on the tractor frame away from the battery. Never connect jumper cable to pipes or thin sheet metal.

CAUTION: Gas given off by batteries is explosive. To avoid injury or battery damage, avoid sparks near the batteries.

To use the can of starting fluid, remove the safety cap and plastic spray button from the can. Remove the cap from the adapter and position the can under the adapter. To inject starting fluid, push up on the can.

CAUTION: To avoid damage, turn engine with starter one or two revolutions before injecting starting fluid. Inject starting fluid only while the engine is turning.

Relax pressure on the can between “shots” of starting fluid. Stop injecting fluid after the engine starts. If the engine begins to die during the first few minutes of operation, inject another “shot” of fluid. When the engine is operating satisfactorily, remove the can from the adapter and replace the safety cap on the can.

Be sure to install the cap on the adapter when it is not in use. This will prevent dust from being drawn into the engine.

Store starting fluid cans where they will not be subject to extreme cold or warm temperatures. For best results, store fluid at room temperature.

CAUTION: Ether starting fluid is highly flammable.

To install the crankcase oil heater, drain crankcase oil and remove plug from right front side of case. Apply thread paste to threads of heater, install heater and refill crankcase. When heater is to be put to use, remove protective cap, attach cord, and plug into any convenient 115-volt electrical source with suitable ground.

The connector at the heater has a release lever to lock the connector to the heater. Press the lever when connecting or disconnecting the cord.

If the tractor has a hydraulic pump shut off screw located on top of the hydraulic pump, the starter speed may be increased during cold weather by shutting off the hydraulic pump so that it will not build up pressure. To do so, turn the shut off screw in “clockwise” one turn with a screwdriver. Then turn the screw in by hand until resistance is felt. Turn the screw in one more turn.

After the engine has started, use a screwdriver to back off the shut-off screw out against the internal stop (turn the screw counterclockwise). The pump will now build up pressure.

The hydraulic pump shut-off screw is available from John Deere parts depots for field installation.

An additional method of removing drag from the engine to assist in cold weather starting is to disconnect the power take-off clutch drive. The drive is disconnected when the straight edge of the disconnect lever is up. Drive is disconnected by lifting up lever and rotating it 180 degrees, then returning it to the slot.

NOTE: Always disconnect the power take-off drive when the PTO is not being used.

If the tractor will be used for PTO work, engage the PTO by rotating the lever 180 degrees with the engine stopped. If the drive does not engage easily, momentarily engage the engine starter while maintaining pressure on the lever.

After operating the engine under load, run the engine at slow idle (800 rpm) for at least one or two minutes before stopping. This will allow the engine to cool gradually, preventing uneven contraction of parts and coking of lubricating oil on piston rings, valve guide, etc.

Turn the key switch off. After a few revolutions the engine will stop.

The engine should be at operating temperature before operating it at full load. A practical warm-up is to idle the engine at about 1500 rpm for a few minutes, then operate at a light load (at the next lower speed than normally used for the load) until the engine is at operating temperature.

With the following exceptions, the diesel engine is ready for normal operation.

To facilitate break-in, avoid prolonged periods of engine idling, particularly for the first 100 hours of service.

After the first 100 hours of service, change both the engine oil and oil filter. Thereafter, change the filter at the normal 200 hour interval. If, during the first 100 hours, it is necessary to add engine oil, use the proper single viscosity, specification Mil-L-2104B oil.

NOTE: Observe engine coolant carefully during break-in period. If temperature rises above normal operating range, shift to a lower gear to reduce load on the engine.

The engine is designed to operate at working speeds ranging from 1500 to 2200 rpm. These are variable governed speeds, and the engine can be operated at any speed between the two extremes to meet various working conditions.

Slow idle speed of the engine is 800 rpm.

Since engine speed most used is 2200 rpm and since engine speed must be varied quickly when shifting the transmission, the foot throttle is usually used to control engine speed.

The foot throttle is used to raise engine speed above the speed selected by the hand throttle. When the foot throttle is pushed all the way downward, the engine operates at the 2200 rpm load speed.

The hand throttle is normally used to control engine speeds when the tractor is operated without the scraper.

The hand throttle may be used to select slow idle or any of the engine working speeds from 1500 to 2200 rpm. When the throttle is moved all the way forward, the engine operates at the 2200 rpm load speed.

To obtain the slow idle speed of approximately 800 rpm, move the throttle to the rear as far as it will go.

Shifting is accomplished by means of two levers located to the left and forward of the instrument panel. The range selector lever is used to shift between stations. By moving the lever from one station to another, a new range of speeds is available. This shift is made when the tractor is stopped or by using the proper “double-clutching” technique when the tractor is moving. The desired speed within a range is selected by means of the Hi-Lo shift lever, located at the right of the range selector lever.

The Hi-Lo shift lever has four positions: “L” (Low), “N” (Neutral), “H” (High), and “R” (Reverse). When the Hi-Lo shift lever is in the “L” position the transmission is in the lower speed of the range. When the lever is in the “H” position, the transmission is in the higher speed of the range. When the lever is in the “R” position, the transmission is in reverse.

Depress the clutch pedal and move the range selector lever into the desired station. Move the Hi-Lo shift lever from neutral to “H,” “L,” or “R” to obtain the desired speed within the range. Gradually release the clutch to take up the load smoothly. With the clutch pedal depressed, the Hi-Lo shift lever can be shifted from the low to the high or the high to the low range of speeds in any station while the tractor is moving. The lever can also be shifted from forward to reverse (except in Station No. 4) without stopping the tractor. To avoid injury or damage, reverse direction only at very slow speeds.

Normally, shifting between stations is made while the tractor is in motion by double clutching when shifting. Basically this is a matter of engaging the clutch momentarily while the range selector lever is in neutral, and bringing the engine speed up or down to match the speed of the next desired station.

For example, to shift up from 5th speed (engine at 2200 rpm) to 7th speed: Leave the Hi-Lo shift lever in “H,” depress the clutch pedal, release the foot throttle, and move the range selector lever to neutral. Momentarily engage the clutch until engine speed has decreased to about 1200-1400 rpm. Disengage the clutch, move the range selector lever to 7th speed, and engage the clutch. This shift requires a little time (2 to 5 seconds) and cannot be rushed or clash will result. Note that engine speed is reduced about 50 percent.

Down shifting must be done rapidly. To down shift from 7th to 5th speed, for example, reduce engine speed to 1300-1500 rpm, disengage the clutch (but do not let up on the foot throttle), and move the range selector lever against the upper neutral stop. Rapidly engage and disengage the clutch, move the selector lever to 5th speed, and engage the clutch. The entire shift requires only 1 to 2 seconds.

CAUTION: Do not overspeed the engine when the clutch is engaged after down shifting. To prevent overspeeding of the engine, avoid down shifting when the engine speed is 1500 rpm or higher.

The above procedures with minor variations to meet operating conditions, will result in “no clash” shifts between range stations but require practice. Avoid forcing the shift lever when a mismatch occurs due to improper timing during the shifting process. Unnecessary clash may cause damage. In general, double clutching is necessary for any shift of the range selector lever while the tractor is in motion.

To engage the differential lock, depress the operating pedal and hold it until conditions improve. Releasing the pedal pressure disengages the lock. The front wheels should be in the straight ahead position when the differential lock is engaged or disengaged.

NOTE: So long as the differential lock is applied any attempt to turn the tractor will be resisted by the action of the locked differential. Under some conditions it may be necessary to engage the lock intermittently to maintain tractor motion in the direction desired.

CAUTION: Do not operate the tractor at high speeds or attempt a sharp turn with the differential lock engaged.

When the tractor is stopped for parking, move the Hi-Lo shift lever to the “N” (neutral) position and move the range selector lever as far as it will go forward into the “PARK” position. The lever, once in “PARK,” must be moved from this position before the Hi-Lo shift lever can be moved from neutral.

CAUTION: Be sure tractor is stopped before placing shift lever in “PARK” position.

Place the range selector lever in any neutral position and the Hi-Lo shift lever in the “N” (neutral) position when towing the tractor. This will eliminate unnecessary wear of the transmission parts. Be sure the transmission oil level is at the full mark. If the frontend is raised for towing, add 1 gallon of oil for each six inches the front end is raised. When possible, run the engine to maintain hydraulic pressure for power operation of steering and brakes.

CAUTION: Never tow the tractor at high speed. Always attach tow bars or chains to the tow hooks provided.

NOTE: The tractor brake pedals should always be locked together when operating the rock wagon or scraper unit except when it is necessary to use individual braking to make extremely short turns.

On scraper units, the scraper power brakes are operated by a lever located at the left of the steering column, just under the steering wheel. On tractors with Athey Rock Wagons, this lever is the brake selector lever and controls the operation of the rock wagon brakes.

CAUTION: Always apply the scraper brakes first when stopping the unit. Then, if necessary, use tractor brakes to assist. Using tractor brakes alone can be dangerous due to possible jackknifing of the unit.

When the brake selector lever is in the center position, both the tractor brakes and the equipment brakes are applied whenever both brake pedals are depressed. When one brake pedal is depressed for individual brake application, only the one tractor brake will be applied.

When the brake selector lever is held in the forward position, only the tractor brakes will be applied when the brake pedals are depressed.

When the brake selector lever is pulled rearward, the brake selector lever applies only the equipment brakes.

CAUTION: Under poor traction conditions, avoid jackknifing by applying the equipment brakes first with the brake selector lever. For more brakes, gradually depress both brake pedals to apply the tractor brakes. Never use tractor brakes alone to slow or stop the tractor and rock wagon or other trailing equipment. When traveling at transport speeds, always couple the brake pedals together to prevent accidental application of only one tractor brake.

Moving the operating lever away from the operator engages the clutch; moving the lever toward the operator disengages the clutch and applies the PTO brake (brake is designed to stop only the PTO shaft).

No. 1 valve operating lever has the following positions: away from the operator to lower the scraper bowl, spring-centered neutral, and toward the operator into a detented raise position. The lever will remain in the detented raise position until it is moved toward neutral.

No. 2 valve operating lever has the following positions: away from the operator into a detented dump position, spring-centered neutral, and toward the operator into a detented position to close the bowl bottom. The lever will remain in the detented position until it is moved toward neutral.

No. 3 valve operating lever has the following positions: toward the operator into a detented equipment raise position, spring-centered neutral, part way away from the operator for power lowering, and all the way away from the operator into a detented float position. The lever will remain in the detented positions until it is moved toward neutral.

When the float lock out lever is up the No. 3 operating lever cannot be moved into the float position. When the float position is desired, push the lever in and turn it down.

On tractors with a single selective control valve, the valve operating lever has the same operating positions as the No. 3 operating lever in Figure 10-10-16. The single selective control lever does not have a float lock out mechanism.