621G Wheel Tractor-Scraper Maintenance Interval Schedule Caterpillar


Maintenance Interval Schedule
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Ensure that all safety information, warnings, and instructions are read and understood before any operation or any maintenance procedures are performed.

The user is responsible for the performance of maintenance, including all adjustments, the use of proper lubricants, fluids, filters, and the replacement of components due to normal wear and aging. Failure to adhere to proper maintenance intervals and procedures may result in diminished performance of the product and/or accelerated wear of components.

Use mileage, fuel consumption, service hours, or calendar time, WHICH EVER OCCURS FIRST, in order to determine the maintenance intervals. Products that operate in severe operating conditions may require more frequent maintenance.

Note: Before each consecutive interval is performed, all maintenance from the previous interval must be performed.

When Required

Battery - Recycle
Battery or Battery Cable - Inspect/Replace
Circuit Breakers - Reset
Cutting Edges and End Bits - Inspect/Replace
Draft Arm Wear Plates - Check/Adjust
Ejector Carrier Rollers - Check/Adjust
Ejector Guide Rollers - Check/Adjust
Ejector Support Rollers - Check/Adjust
Engine Air Filter Primary Element - Clean/Replace
Engine Air Filter Secondary Element - Replace
Engine Air Filter Service Indicator - Inspect/Replace
Ether Starting Aid Cylinder - Replace
Fuel System - Prime
Fuses - Replace
Oil Filter - Inspect
Secondary Steering - Test
Steering Pump Outlet Screen - Clean
Window Washer Reservoir - Fill
Window Wiper - Inspect/Replace
Windows - Clean

Every 10 Service Hours or Daily

Air Tank Moisture and Sediment - Drain
Auger Drive Gear Oil Level - Check
Auger Seal - Inspect/Replace
Backup Alarm - Test
Brakes, Indicators and Gauges - Test
Cooling System Coolant Level - Check
Engine Air Filter Service Indicator - Inspect
Engine Air Precleaner - Clean
Engine Oil Level - Check
Fuel System Water Separator - Drain
Fuel Tank Water and Sediment - Drain
Hydraulic Oil Cooler - Clean
Hydraulic System Oil Level - Check
Radiator Core - Clean
Seat Belt - Inspect

Initial 50 Service Hours

Transmission Oil Filter and Magnetic Screen - Replace/Clean

Every 50 Service Hours or Weekly

Bowl Lift Cylinder Bearings - Lubricate
Cab Air Filter - Clean/Replace
Hitch - Lubricate
Tire Inflation - Check

Initial 250 Service Hours (or at first oil change)

Electronic Unit Injector - Inspect/Adjust
Engine Valve Lash - Check
Evaporator Coil and Heater Coil - Clean

Every 250 Service Hours

Cooling System Coolant Sample (Level 1) - Obtain

Every 250 Service Hours or Monthly

Air Dryer - Check
Auger Drive Gear Breather - Clean
Battery - Clean/Check
Belts - Inspect/Replace
Brake Air System Pressure - Test
Braking System - Test
Differential and Final Drive Oil Level - Check
Engine Oil Sample - Obtain
Hydraulic System Oil Sample - Obtain
Transmission Oil Level - Check
Transmission Oil Sample - Obtain
Wheel Bearing Oil Level - Check

Initial 500 Hours (for New Systems, Refilled Systems, and Converted Systems)

Cooling System Coolant Sample (Level 2) - Obtain

Every 500 Service Hours or 3 Months

Accumulator (Cushion Hitch) - Check
Auger Bearing Oil Level - Check
Auger Hydraulic System Oil Filter - Replace
Auger Shoes and Cutting Edges - Inspect/Replace
Brake Camshaft Bearing - Lubricate
Differential and Final Drive Oil Sample - Obtain
Engine Oil (High Speed) and Oil Filter - Change
Engine Oil and Filter - Change
Fuel System Primary Filter (Water Separator) Element - Replace
Fuel System Secondary Filter - Replace
Fuel Tank Cap and Strainer - Clean
Hydraulic System Oil Filter (Pilot) - Replace
Hydraulic System Oil Filter - Replace
Hydraulic Tank Breaker Relief Valve - Clean
Transmission Oil Filter and Magnetic Screen - Replace/Clean

Every 1000 Service Hours or 6 Months

Air Dryer Desiccant - Replace
Brake Air System Warning Horn - Test
Differential and Final Drive Breather - Clean
Rollover Protective Structure (ROPS) - Inspect
Suction Screen (Transmission Scavenge) - Clean
Transmission Breather - Clean
Transmission Oil - Change
Wheel Coolant Level - Check

Every 2000 Service Hours or 1 Year

Auger Bearing Oil - Change
Auger Drive Gear Oil - Change
Brake Shoes and Drums - Inspect/Replace
Condenser (Refrigerant) - Clean
Differential Thrust Pin Clearance - Check
Differential and Final Drive Oil - Change
Ejector Carrier Rollers - Inspect/Pack/Replace
Ejector Guide Rollers - Inspect/Pack/Replace
Ejector Support Rollers - Inspect/Pack/Replace
Electronic Unit Injector - Inspect/Adjust
Engine Valve Lash - Check
Evaporator Coil and Heater Coil - Clean
Hitch - Inspect
Hydraulic System Oil - Change
Wheel Bearing Oil - Change

Every Year

Cooling System Coolant Sample (Level 2) - Obtain
Engine Air Filter Service Indicator - Inspect/Replace
Refrigerant Dryer - Replace

Every 3000 Service Hours or 2 Years

Cooling System Pressure Cap - Clean/Replace
Cooling System Water Temperature Regulator - Replace
Crankshaft Vibration Damper - Inspect

Every 3 Years

Seat Belt - Replace

Every 6000 Service Hours or 3 Years

Cooling System Coolant Extender (ELC) - Add

Every 12 000 Service Hours or 6 Years

Cooling System Coolant (ELC) - Change

Information System:

2009/07/27 New Air Lines and a New Air Motor Are Now Used to Improve the Capability of the Cold Start {1450, 1451, 1462, 1466}
2009/09/28 New Software Released For AccuGrade Office {5267, 7220}
D7E Track-Type Tractor Hydraulic, HVAC, and Electrical Systems Implement Hydraulic Force Is Low
2009/07/27 Improved Procedure for the Retention of the Identification Film for the Roll Over Protective Structure (ROPS) and Falling Object Protective Structure (FOPS) {7323, 7325, 7405, 7557}
2010/01/06 A New Lip Seal for the Final Drive Is Now Used {4050, 4052}
2012/04/09 Improved Friction Disc and Software for the Torque Converter Impeller Clutch on 988H Wheel Loaders {3101, 7610, 7620}
953D, 963D and 973D Track-Type Loaders Hydrostatic Drive Is Sluggish
953D, 963D and 973D Track-Type Loaders Machine Top Speed Is Not Obtained
953D, 963D and 973D Track-Type Loaders Machine Movement Is Unstable
953D, 963D and 973D Track-Type Loaders Hydraulic System Hesitates
2009/10/01 A New Slip Joint Group Improves Service Life of the Drive Shaft {3251}
D7E Track-Type Tractor Hydraulic, HVAC, and Electrical Systems Implement Droops Before Raising
627G Wheel Tractor-Scraper Maintenance Interval Schedule
613G Wheel Tractor-Scraper Maintenance Interval Schedule
D7E Track-Type Tractor Hydraulic, HVAC, and Electrical Systems Implement Cycle Time Is Slow for All Implements
953D, 963D and 973D Track-Type Loaders Hydraulic System Pressure Is High
TS180, TS185, TS220 and TS225 Towed Scrapers Declaration of Conformity
953D Track-Type Loader Declaration of Conformity
2011/01/06 Improvements to the Fuel Sender Group {1273, 1408, 6201, 7481, 7857}
D9T Track-Type Tractor Battery Disconnect Switch
D7E Track-Type Tractor Hydraulic, HVAC, and Electrical Systems Hydraulic Cylinder Collapse - The Lift Cylinder Will Collapse When The Control Is In The Raised Position
D7E Track-Type Tractor Hydraulic, HVAC, and Electrical Systems Implement Does Not Raise
Procedure to Install Improved Brake Oil Cooler Tubes{1380}
Procedure To Install New Heat Shields{1067, 1073}