Sumitomo Best SH125X 3 SH135X Service Repair Workshop Manual

This is the COMPLETE Service and Repair Manual for the Sumitomo Best SH125X 3 SH135X Service Repair Workshop Manual. It covers every single detail.

Sumitomo Best SH125X-3 SH135X Service Repair Workshop Manual PDF VEHICLE/EQUIPMENT INTRODUCTION: The Sumitomo SH125X-3 and SH135X represent the third generation of Sumitomo hydraulic excavators in the 12-13 ton operating class. Sumitomo Construction Machinery has a long-standing reputation for building reliable, fuel-efficient hydraulic excavators that excel in urban construction, utility work, and general earthmoving. The X-3 series features a refined cab with improved ergonomics, a fuel-efficient Isuzu diesel engine meeting Tier 3/Stage IIIa emissions standards, and the advanced SPATEC electronic control system that optimizes hydraulic flow for smooth, precise digging and lifting. These excavators are equipped with a powerful boom and arm combination, a generous bucket capacity, and an auto-deceleration system that reduces fuel consumption during idle periods. The SH125X-3 and SH135X are popular choices for rental fleets, small contractors, and municipal public works departments. SERVICE & REPAIR SCOPE: - Isuzu diesel engine overhaul including cylinder head, injector, and turbocharger service - Fuel system diagnostics: high-pressure pump testing and injector coding - Hydraulic main pump flow testing and regulator valve adjustment - Control valve spool inspection and load-sensing signal circuit testing - Travel motor overhaul with piston and barrel inspection - Swing motor and swing reduction gear service with backlash setting - Boom, arm, and bucket cylinder rebuild with seal kit installation - Relief valve calibration for boom, arm, bucket, swing, and travel circuits - Auto-deceleration motor and electronic control module diagnostics - Undercarriage service: track tension adjustment, idler replacement, roller inspection - Hydraulic oil cooler cleaning and radiator pressure testing - Operator cab HVAC service with refrigerant system repair - Alternator and starter overhaul with output verification - Safety lock solenoid circuit testing and diagnostic code retrieval TECHNICAL SPECIFICATIONS: - Engine: Isuzu diesel, Tier 3/Stage IIIa - Operating weight: approximately 12-13 metric tons - Hydraulic pump: Variable displacement axial piston - Max hydraulic flow: Check manual for specifications - Travel speed: Two-range hydrostatic drive - Swing system: Axial piston motor with planetary reduction - Undercarriage: Track shoe with carrier and lower rollers - Bucket breakout force: See manual for SH125X-3 and SH135X specifications DIAGNOSTIC INFORMATION: - Excavator lacks digging power: test main pump pressure at relief, inspect control valve spool wear, check engine RPM under load - Slow swing speed: inspect swing motor case drain flow, verify swing relief valve setting, examine swing bearing gear wear - Track drive pulls to one side: check travel motor output, test counterbalance valve, inspect final drive planetary gear - Hydraulic oil runs hot: clean cooling core, inspect relief valve bypass, verify correct oil viscosity for ambient temperature - Eng

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