Caterpillar Mini Hydraulic Excavator 301.8

Steps to change the Final Drive Oil

Hydraulic System Oil Filter (Return) - Replace

Steps to replace the Hydraulic System Oil Filter

Sign off on the maintenance procedure

WARNING: Hot oil and hot components can cause personal injury. Do not allow hot oil or hot components to contact skin.

NOTICE: If the machine is filled with non-biodegradable hydraulic oil and biodegradable hydraulic oil is wanting to be used, consult a Cat dealer. Biodegradable hydraulic oil can NOT be added to the system by performing an ordinary hydraulic oil change. Damage to the hydraulic system can occur.

NOTICE: Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Park the machine on level ground. Prepare the machine for maintenance.

WARNING: Pressurized system! The hydraulic tank contains hot oil under pressure. To prevent burns from the sudden release of hot oil, relieve the tank pressure with the engine off. Relieve pressure by slowly turning the cap until the cap reaches the secondary stop.

Relieve the internal pressure in the hydraulic tank by slowly loosening oil filler cap (1).

Start the engine and run the engine for a fewminutes.

Note: The oil must be free of bubbles. If bubbles are present in the oil, air is entering the hydraulic system. Inspect the suction hoses, the hose clamps, and the hydraulic oil filter. Bleed the hydraulic pump after performing a hydraulic oil change and using a vacuum pump - otherwise severe damage to the pump can occur.

Wipe all fittings before lubricating

Apply lubricant to the fittings for the arms (1) that support the blade

Apply lubricant to the fittings of the blade cylinder (2)

Boom and Stick Linkage - Lubricate

Position the machine into the service position

Wipe all fittings before you apply lubricant

Apply lubricant to grease fittings (1) at each cylinder end

Apply lubricant to grease fittings (2) at the boom cylinder pin joint

WARNING: Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loose the cap slowly to relieve the pressure.

Cooling System Coolant Extender (ELC) - Add

Additional information on the addition of extender

Sign off on the maintenance procedure

Swing Gear and Bearing - Lubricate

WARNING: Do not rotate the machine during lubrication. Danger of severe crushing that can cause severe injury or death.

Is the machine parked on a level surface?

Are all work tools lowered to the ground?

Is the hydraulic lockout control in the RAISED position?

Fittings (1), (2), and (3) for the swing cylinder, bearing, and gear are on the right side of the machine on the upper carriage.

Are the fittings wiped and lubricated?

Is the upper structure rotated for 90°?

Is grease applied to the fitting for the swing bearing?