Jcb 805

JCB 805 maintenance relies on the 500-hour engine oil interval, enabled by EcoMAX/Dieselmax engines without DEF. Take baseline oil samples from the engine, hydraulic tank, and final drives at the first 500-hour service. Compare subsequent samples against this baseline to detect bearing wear or contamination. Monitor the hydraulic return filter magnet for metallic debris during every 500-hour service. Use JCB Engine Oil Special or equivalent 15W-40 diesel oil meeting API specs. Extended intervals reduce service stops but require strict adherence to sampling protocols to prevent catastrophic engine failure.

Common 805 repairs involve the hydraulic pump and motor assemblies. The 805 uses either Hamworthy or Commercial pumps; verify the unit type before ordering parts. Replace hydraulic filter elements every 400 hours to prevent siphoning issues when draining the tank. Inspect the rotary coupling for leaks at the slew ring interface. Check the track relief valve operation if travel speed drops. Replace worn track rollers and idler wheels when sag exceeds limits. Address cylinder rod scoring and fitting weep at the kingpost to maintain hydraulic pressure and system integrity.

The 2000-hour service mandates a swing ring play measurement using dial indicators to check radial and axial clearance. Torque slew ring bolts to specification to prevent structural failure. Inspect the slew gearbox and track gearbox for metal shavings during drain. Check the turbocharger shaft play and wastegate function on Dieselmax engines. Replace injector spray patterns if diagnostic tools indicate poor atomization. Inspect the cooling system for corrosion and replace the coolant to prevent overheating. Structural welding on the boom or chassis is prohibited without OEM approval.

In cold climates, check the battery electrolyte levels in non-sealed units and ensure the cooling system is protected against freezing. Clean the undercarriage regularly to prevent debris buildup that accelerates roller and track wear. In dusty environments, inspect the air filter restriction indicator frequently and clean the radiator fins to maintain cooling capacity. Store the machine under cover to protect the cab HVAC and electrical components from moisture. Verify track tension seasonally as temperature changes affect rubber track elasticity and machine stability.