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| Home / Skid Steer Loaders / Bobcat Skid Steer Loaders / Bobcat 773 G-Series |
Bobcat 773 G-Series Problems
The
Bobcat 773 G-Series skid steer loader driveline system components: a 122 cu.in
(2.0L) Kubota V2003T-EB 4-cylinder turbo diesel engine with a rated power of 56
hp (41.5 kW), and 1-speed hydro transmission. The hydraulic system has a pump
with a rated capacity of 16.7 gal/min (63 l/min) or 27 gal/min (102 l/min). The
system pressure is 3000 psi (207 bar). The Bobcat 773G is equipped with a
vertical-lift boom, 80HS drive chains, and 10x16.5 standard tires. The
skid steer has a max lift height of 118.2" (3000 mm) to hinge pin and
dump height of 91" (2310 mm). The rated operating capacity is 1850 lbs (840 kg),
and tipping load is 3900 lbs (1770 kg).
| Engine Troubleshooting |
Engine starts hard or doesn't start
There is air in the fuel system - Bleed the system.
Fuel filter element is clogged - Clean or change the filter.
Fuel injection nozzles are dirty or defective - Replace injection nozzles.
Water or dirt in fuel system - Drain, flush, and service the system.
Valve clearance is wrong - Adjust valve clearance.
Fuel injection pump is faulty - Change or repair the pump.
Engine starts and stalls suddenly
Air cleaner is dirty - Install new air cleaner element.
Fuel filter plugged - Replace filter element.
Fuel injection pump leakage - Check the fuel injection pump for leaks and fix it.
Defective or clogged fuel injectors - Replace fuel injectors.
Fuel injection pump is not operating properly - Rebuild or change fuel pump.
Engine shuts off suddenly during operation
Low coolant temperature - Warm up the engine.
Fuel filter is plugged - Install new filter element.
Air in the fuel lines - Bleed the fuel lines.
Clogged or burnt injection nozzle - Check injection nozzles and replace if required.
Incorrect adjustment of fuel injection pump timing - Adjust the pump as required.
Engine stops while idling
Incorrect low idle speed adjustment - Test and adjust.
Damaged fuel injection pump - Replace or repair injection pump.
Fuel injector fault - Test and replace fuel injectors if necessary.
Excessive valve clearance - Check and adjust.
Diesel engine loses power
Dirty air cleaner - Install new air cleaner element.
Fuel injection nozzles are damaged or dirty - Change fuel injection nozzles.
Fuel injection pressure is incorrect - Adjust to proper pressure.
Valve clearance is wrong - Adjust valve clearance.
Wrong adjustment of low idle speed - Adjustment required.
Fuel hoses or lines clogging - Service fuel hoses and lines.
Damaged cylinder-head gasket - Cylinder-head gasket replacement required.
Piston rings are leaking or defective - Change piston rings.
Engine overheats
Lack of engine coolant - Fill the cooling system and check components for leaks or other faults.
Engine oil insufficient - Checking oil level and add if necessary.
Radiator fins are dirty or radiator cap is defective - Install new cap or clean radiator.
Fan belt is broken or worn - Install new fan belt.
Engine is overloaded - Load reducing required.
Low oil pressure
Engine oil level low - Checking oil level and add if necessary.
Dirty oil filter - Clean or change engine oil filter.
Incorrect engine oil Use the specified type of engine oil.
Excessive main bearing oil clearance - Replace bearings.
Oil pump failure - Repair or change.
Abnormal engine knocking or noise
Engine oil level is low - Add oil to the engine crankcase.
Low coolant temperature - Warm up to required temperature.
Improper setting of fuel injection pump timing - Adjust the pump as required.
Incorrect low idle speed adjustment - Adjustment required.
Fuel injectors are faulty or clogged - Replace fuel injectors.
Faulty or misaligned connecting rod - Replace or align connecting rod.
Scored or worn pistons - Pistons need to be replaced.
| Drive System Troubleshooting |
Drive system will not operate in either direction
Hydraulic fluid level low - Fill up the hydraulic fluid.
Drive chain failure - Check drive chain and change defective components.
Worn or defective relief valve - Rebuild or install a new relief valve.
Plugged suction line or hydraulic filter - Service suction line or change hydraulic filter.
Defective or worn foot or hand controls - Replace or repair.
Drive motor or pump failure - Inspect and replace as necessary.
Low power
Hydraulic oil filter is plugged - Replace or clean hydraulic filter.
Relief valve is damaged or open - Close or change relief valve.
Worn or faulty transmission components - Inspect and change defective parts.
Worn input drive shaft - Faulty drive shaft need to be replaced or repair.
Air in hydraulic system - Bleed air from hydraulic system.
Drive system overheats
Hydraulic fluid level low - Check and refill the hydraulic fluid.
Clogged hydraulic fluid filter - Change hydraulic filter.
Relief valve is defective - Change or repair defective relief valve.
Damaged drive pump or hydraulic motor - Inspect and replace as necessary.
Plugged hydraulic oil cooler - Clean the cooling fins.
Overloaded drive system - Reduce loading.
Drive system is noisy
Improper oil viscosity - Use the specified type of oil.
Air in the hydraulic system - Air bleeding is required.
Drive pump or hydraulic motor is damaged - Inspect and replace as necessary.
Mechanical parts of drive system are defective or worn - Inspect drive system and replace faulty parts.
| Hydraulics Troubleshooting |
Hydraulic system has overheating
Hydraulic pressure is not adjusted correctly - Adjust pressure correctly.
Main relief valve improper adjustment or failure - Adjust or change relief valve.
Hydraulic oil is dirty - Fill up with fresh hydraulic oil.
Hydraulic fluid level is low - Check and refill the hydraulic fluid.
Defective hydraulic pump - Repair or replace pump if necessary.
Lift arm can't drop or lift
Defective lift controls - Repair or change.
Defective hydraulic pump - Repair or change pump if required.
Hydraulic control valve failure - Repair or replace the valve.
Defective hydraulic cylinder - Repair or replace hydraulic cylinder.
Insufficient hydraulic oil - Checking hydraulic oil level and add if necessary.
Bucket is not working
Bucket tilt controls are damaged - Inspect and repair if necessary.
Hydraulic pump is broken - Repair or change pump if required.
Hydraulic control valve is faulty - Repair or change the valve.
Faulty hydraulic bucket cylinder - Install a new cylinder or repair it.
Insufficient hydraulic fluid - Checking hydraulic fluid level and add if necessary.
Bucket or lift arm is moving slowly
Hydraulic pump is worn - Test the pump performance and change pump if required.
Hydraulic cylinder leaking - Repair leak by replacing the seals.
Insufficient hydraulic oil - Fill the system to proper hydraulic oil level.
Hydraulic control valve is faulty or out of adjustment - Repair or adjust properly.
Hydraulic pressure has dropped - Adjust pressure correctly.
Jerky operation of the bucket or boom
Air in the hydraulic system - Need to bleed air.
Plugged hydraulic oil filter - Clean or change the filter.
Hydraulic fluid is dirty - The fluid must be changed.
Cylinder tube or rod scoring - Replace failed component.
Hydraulic pump is noisy
Not enough oil or hydraulic system leaking - Repair hydraulic leaks or add oil as required.
Hydraulic filter is dirty - Clean or change the filter.
Dirty suction line - Suction line needs to be cleaned.
Pump is sucking air - Remove air from hydraulics.
Damaged pump components - Change or rebuild pump.
| Electrical Troubleshooting |
Battery is not charging
Electrical cable connections are loose or corroded - Service or tighten connections.
Battery terminal connectors are defective - Change terminal connectors.
Battery is worn - Battery replacement required.
Belt is damaged or loose - Change belt or adjust belt tension.
Starter turns slowly
Battery capacity is low - Low battery charging, charge as required.
Battery won’t hold charge - Service battery or change it.
Bad battery terminals or disconnected wiring - Check wiring connections and replace or clean terminals.
Starter motor is not working
Battery is drained or defective - Recharge or replace battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Battery power is low - Recharge the battery.
Faulty starter motor - Starter should be changed.
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| SKID STEER LOADERS SPECIFICATIONS |