Adjust Alternator Belts Kelas11 perawatan engine dan unit alat berat 6 1398

175 NOTE: If only one belt of a matched set is replaced, it will carry more of a load than the belts not replaced since the older belts are stretched. The additional load on the new belt could cause it to break.

2. Adjust Fan Drive Belts

1. To adjust the fan drive belts, loosen mounting bolts and adjust with adjusting bolt. 2. Move the fan drive up or down as required to obtain the correct adjustment. Tighten mounting bolts. 3. If new belts are installed, check belt adjustment again after 30 minutes of engine operation. HOSES AND CLAMPS

1. InspectReplace

Hose replacement prior to failure is a cost effective preventive maintenance practice. Replacing a hose before it fails saves money and reduces the chances for unscheduled downtime. By replacing a hose that is cracked, soft or leaking, you will avoid major repairs that could result in a severe engine overheating problem. Inspect all hoses for leaks due to cracking, softness and loose clamps. Replace hoses that are cracked or soft, or tighten loose clamps. Before Replacing Hoses 1. After engine is cool, loosen the radiator filler cap slowly to relieve any pressure and remove the cap. 2. Drain the coolant from the cooling system to a level below the hose being replaced. 3. Remove the hose clamps, disconnect the old hose and replace with a new hose. 4. Install hose clamps. See the Torque for Standard Hose Clamps-Worm Band Type chart in the Torque Specifications section of this publication for the appropriate torque. NOTE: For constant torque hose clamps, see the Torque Specifications section in this publication. After Replacing Hoses 1. Add coolant mixture to the cooling system. Bring it to the proper level by mixing a solution of acceptable water and Caterpillar Antifreeze. Test for supplemental additive concentration. Add proper amount, or if equipped with a coolant additive 176 element, install the appropriate element ONLY if using another type of antifreeze. 2. Install the filler cap. 3. Start the engine and inspect for leaks. 4. Check water temperature gauge for proper operating temperature. ALR-TO-AIR AFTERCOOLER SYSTEM 1. Caterpillar discourages the use of winter fronts or other air flow restriction devices mounted in front of radiators with air-to-air aftercooled engines. Air flow restriction can cause higher exhaust temperatures, power loss, excessive fan usage and a reduction in fuel economy. 2. A slight reduction in power or response, or a small increase in exhaust temperature, may indicate a small air leak in the charge air cooler core or piping. 3. An aftercooler hose, gasket or duct failure, or significant system leak will cause a large drop in boost pressure and power. The engine can be operated at this power level long enough to reach a safe stop or repair area. Sustained operation under this condition should be avoided. Inspect Check Inspect all air ducting and gasket connections at each oil change. Constant torque hose clamps should be used to secure the ducting. Tighten these clamps until the spring is at least partially compressed. Check with your OEM manufacturer or the Torque Specifications section of this manual for the appropriate torque specifications.

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