JOHN DEERE 990 (01) PDF Document

Escaping fluid under pressure can penetrate the skin, causing serious injury. Relieve pressure before disconnecting hydraulic or other lines. Tighten all connections before applying pressure. Keep hands and body away from pinholes and nozzles which 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, it must be surgically removed within a few hours by a doctor familiar with this type injury or gangrene may result.

The maintenance area should be well-ventilated.

Keep maintenance area clean and dry.

Store flammable materials in a cool and well-ventilated area out of reach of unauthorized personnel.

Do not work on the equipment unless you are approved to do so. Then be sure you know the correct procedure.

Do not work on equipment while it is being operated.

Keep hands away from moving parts.

When the engine is running, do not work on equipment unless the procedure is approved.

If you must work on the machine with the engine running, ALWAYS USE TWO service technicians. One must be at the controls. The other must be within sight of the operator.

Put a support under all raised equipment.

Park the machine across a slope, or use blocks to hold it in place.

Do not lift heavy parts by yourself. Use a hoist or jack.

TAKE CARE! WATCH OUT FOR OTHER PEOPLE IN THE AREA.

When you drill, grind or hammer metal, wear safety glasses.

Keep ALL equipment free of dirt and oil.

Clean oil, grease, mud, ice or snow from the operator’s station, steps and hand rails.

Do not remove the radiator cap unless the engine is cool. First, loosen the cap slowly to the stop. Then release all pressure in the cooling system before you remove the cap.

Check the exhaust system regularly for leaks.

Release hydraulic pressure before you work on the hydraulic system. See page 1-1-06.

When you check hydraulic pressure, be sure to use the correct test gauge.

Before you work on the fuel system, close the fuel shutoff valve.

Do not work under a raised bucket. Lower the bucket to the ground, or put blocks under the bucket.

All protective parts (shields, guards, ROPS, etc.) should be in good condition and fastened in place.

Check for leaks in all systems:

• Air intake system
• Engine oil system
• Hydraulic system
• Fuel system
• Cooling system

Do not smoke while you fill the fuel tank.

Do not smoke while you work with material that will start on fire easily.

Stop the engine before you fill the fuel tank.

Do not fill fuel tank if engine is hot.

Do not use gasoline or diesel fuel for cleaning parts. Use solvents that will not start on fire.

Do not put metal objects across terminals to check the battery charge.

When you charge a battery, be sure there is enough ventilation.

Keep sparks and flames away from batteries.

Do not smoke near battery.

Before you work on the electrical system, or make major repairs, turn off the battery disconnect switch.

Follow these steps before you work on any part of the hydraulic system:

1. Park the excavator on level ground.

2. Lower hydraulic pressure:

• Lower bucket to ground.
• Stop engine.
• Move control levers until boom and bucket do not move.

3. Push valve levers in all the way to stop oil flow.

4. Loosen the reservoir filler cap slowly to release pressure.

5. Open the diffuser vent. Turn it counterclockwise.

IMPORTANT: After you finish:

• Close diffuser vent.
• Pull levers out.

CAUTION: Do not walk or stand on sloping fenders or other sheet metal to service the excavator.

Power (@2100 engine rpm):

Net engine flywheel power is for an engine equipped with fan, air cleaner, water pump, lubricating oil pump, alternator, and muffler. Gross engine power is without fan. Power ratings are under SAE standard conditions of 500-ft. (150 m) altitude and 85°F (29.5°C) temperature, and DIN 6270 conditions (non-corrected). No derating is required up to 7,500 ft. (2286 m) altitude.

Engine: John Deere turbocharged V-8 diesel, valve-in-head, 4-stroke cycle.

Bore and stroke: 5.5 x 5.00 in. (140 x 127 mm)

Piston displacement: 955 cu. in. (15.652 L)

Compression ratio: 15.5:1

Max. torque @ 1300 rpm: 858 lb-ft (1163 N·m) (118.6 kg-m)

Lubrication: Pressure system w/full-flow filter

Cooling: Pressurized w/thermostat and fixed bypass

Air cleaner w/restriction indicator: Dry

Electrical system: 24 volts w/alternator

Batteries (4) 12-volt. Reserve capacity: 420 minutes each

Cylinders:

All cylinders have phenolic wear rings. Boom, arm and bucket cylinders have a built-in hydraulic cushion at each end of the stroke. Full-width hydraulic oil cooler matched with engine coolant radiator.

Three open-center pumps mounted in line are coupled directly to the flywheel. The total flow is 170 gpm (10.72 L/s) at rated engine rpm. System operating pressure is 2800 psi (19 306 kPa) (196.8 kg/cm²) for the propel circuit and 2700 psi (18 616 kPa) (190 kg/cm²) for the digging circuit.

Relief valves:

• Boom (2) …3000 psi (20 685 kPa) (210.9 kg/cm²)
• Arm (2) ….3000 psi (20 685 kPa) (210.9 kg/cm²)
• Bucket (2)..3000 psi (20 685 kPa) (210.9 kg/cm²)

Oil filtration:

• Two 149-micron suction screens
• Two 10-micron filters in return lines
• Three 40-micron high pressure filters

Swing speed: 5.8 rpm

Bucket tangential digging force:

• 39, 45, or 51-in. (990, 1143, or 1295 mm) bucket: 42,500 lb. (190 kN) (19 278 kg)
• 33 or 39-in. (838 or 990 mm) heavy-duty bucket: 41,000 lb. (184 kN) (18 598 kg)
• 45-in. (1143 mm) heavy-duty bucket: 42,500 lb. (190 kN) (19 278 kg)

Gradability: 90 percent

Travel: 0 to 2.1 mph (3.38 km/h)

Locked in low: 0 to 0.9 mph (1.45 km/h)

Dimensions (Based on unit equipped with 140-in. (3.56 m) arm, 45-in. (1143 mm) bucket, 30-in. (750 mm) track shoes, and standard equipment):

Swing: 360-degree, internal drive, continuous

Turntable bearing: Single row, ball

Case-hardened ring and pinion gears run in lubricant.

Propel motors (one for each track): High-torque axial-piston hydraulic motors with planetary drive. Multiple-disk brakes automatically release while propelling, and apply when stationary. Independent drive to each track permits counterrotation.

Undercarriage, car body, and track frame: Each track frame is a formed, reinforced U-channel. Track frames are joined by reinforced boxed car body with swing bearing mount.

Track Chain: Sealed track chain

Track Adjustment: Hydraulic

Capacity:

Heavy-duty:

Track Shoes:

Cab: Steel, with urethane sound-proofing on ceiling and side walls, and cushioned neoprene floor mat. Safety glass on all sides and top. Front and rear windows open. Front window can be stored overhead.

Seat: Fully adjustable heavy-duty cloth, foam-rubber cushioned seat.

Controls: Pilot-operated two-lever for boom, arm, bucket, and swing. Pilot-operated right and left pedals control forward and rearward movement of right and left tracks respectively.