Caterpillar Backhoe Loader 450E

Cooling System Water Temperature Regulator - Clean/Replace

Replace the thermostat on a regular basis in order to reduce the chance of unscheduled downtime and of problems with the cooling system. Failure to replace the engine's thermostat on a regularly scheduled basis could cause severe engine damage.

The thermostat should be replaced after the cooling system has been cleaned. Replace the thermostat while the cooling system is completely drained or while the cooling system coolant is drained to a level that is below the thermostat housing.

Note: If you are only replacing the thermostat, drain the cooling system coolant to a level that is below the thermostat housing.

Caterpillar engines incorporate a shunt design cooling system. It is mandatory to always operate the engine with a thermostat.

1. Install the lift cylinder brace. Refer to Operation and Maintenance Manual, “Lift Cylinder Brace - Connect and Disconnect” for more information.

3. Loosen the hose clamp and remove the hose from the thermostat housing assembly.

4. Remove the bolts from the thermostat housing assembly. Remove the thermostat housing assembly.

Engine Crankcase Breather - Replace

Loosen the clamp (9) and remove the hose (10) from the connector (12)

Remove the setscrews (8) and remove the connector (12) from the cylinder head. Remove the gasket (13). Remove the O-ring seal (11) from the connector. Discard the gasket (13) and the O-ring seal (11)

Remove the cover (1) from the valve mechanism cover (5)

WARNING: Personal injury can result from parts and/or covers under spring pressure. Spring force will be released when covers are removed. Be prepared to hold spring loaded covers as the bolts are loosened

Remove the screws (2). Remove the plate (3)

Remove the diaphragm (4) and the cap (6). Remove the spring (7). Discard diaphragm (4)

WARNING: Improper assembly of parts that are spring loaded can cause bodily injury. To prevent possible injury, follow the established assembly procedure and wear protective equipment

Install the spring (7), the cap (6), and a new diaphragm (4)

Note: The normal hydraulic oil change interval is at every 2000 Service Hours or 1 Year. By performing S·O·S oil analysis, the hydraulic oil change interval may be extended to 4000 Service Hours or 2 Years. S·O·S oil analysis must be performed at every 500 Service Hours or 3 Months in order to extend the hydraulic oil change interval.

The results from the S·O·S oil analysis will determine if the hydraulic oil change interval may be extended. If S·O·S oil analysis is not available, the hydraulic oil change interval must remain at every 2000 Service Hours or 1 Year.

Refer to the Operation and Maintenance Manual, “S·O·S Information”.

Note: Cat HYDO Advanced 10 has a 50% increase in the standard oil drain interval for machine hydraulic systems (3000 hours versus 2000 hours) over second and third choice oils - when following the maintenance interval schedule for oil filter changes and for oil sampling that is stated in the Operation and Maintenance Manual for your particular machine.

6000 hour oil drain intervals are possible when using S·O·S Services oil analysis. Contact your Cat dealer for details.

Operate the machine for a few minutes in order to warm the hydraulic system oil.

The machine should be level . Lower the bucket to the ground and apply slight downward pressure. Engage the parking brake and stop the engine.

The hydraulic tank filler cap is located under the access door on the top of the engine compartment.

Always recycle a battery. Never discard a battery.

Always return used batteries to one of the following locations:

• An authorized battery collection facility

Battery or Battery Cable - Inspect/Replace

1. Turn the engine start switch to the OFF position. Turn all switches to the OFF position.

2. Disconnect the negative battery cable from the frame.

Backhoe Control Console Latch - Lubricate

1. Remove the three bolts and remove the console(1).

2. Place the latch in the closed position.

3. Apply 242-6990 Lubricant onto the following:

• Pivot for the release lever (2)

• Notches and catch for the rotor (5)

• Contact for the release lever (6)