Bobcat 553 Skid Steer Loader Service Repair Manual 6903125 PDF

Description

Bobcat 553 Skid Steer Loader Service Repair Manual 6903125 PDF

The Bobcat 553 Skid Steer Loader Service Repair Manual 6903125 PDF is a detailed mechanic-level service reference for the Bobcat 553 loader. The manual covers machines in the S/N 528011001 & Above and S/N 528111001 & Above ranges and is specifically equipped around the Bobcat Interlock Control System (BICS™). Its procedures extend well beyond routine maintenance, with removal and installation instructions, component disassembly and assembly, inspection, adjustment, testing, troubleshooting, hydraulic and electrical schematics, engine reconditioning procedures, torque data and machine specifications.

This 342-page manual is structured around the major systems of the loader, allowing technicians to move from scheduled service and basic checks into hydraulic diagnosis, hydrostatic drive repair, axle and chaincase work, BICS testing, electrical component overhaul and extensive engine repair. Photographs, illustrations, exploded component drawings and system schematics accompany many of the procedures.

File Details

• Manual type: Service Manual
• Brand: Bobcat
• Model: 553 Bobcat Loader
• Serial coverage: S/N 528011001 & Above; S/N 528111001 & Above
• Language: English
• Pages: 342
• File format: PDF
• Manual number: 6903125
• Cover issue: 6903125 (2-06)

Service Coverage for the Bobcat 553

The manual begins with service safety, serial-number identification and machine identification before moving into system-specific repair information. The foreword states that the manual is intended for the Bobcat loader mechanic and provides servicing and adjustment procedures for the loader, its component parts and systems. Post-repair inspection items include the lift arm support device, ROPS hardware, seat belt and seat bar, parking brake, Bob-Tach wedges, lights, fluid levels, steering and pedal return, charging system, tires and BICS operation.

Maintenance coverage includes a service schedule, engine oil and filter service, cooling-system care, air cleaner servicing, fuel-system bleeding, hydraulic/hydrostatic fluid and filter replacement, chaincase oil checks, lubrication points, tire service, spark arrestor cleaning and Bob-Tach inspection. The manual also provides safe procedures for lifting and blocking the loader, raising the operator cab, installing the lift arm support device, towing and transporting the machine.

Hydraulic, Hydrostatic and Drive Repair

A major part of the Bobcat 553 Skid Steer Loader Service Repair Manual 6903125 PDF is devoted to the loader’s hydraulic and hydrostatic systems. Hydraulic coverage includes lift and tilt cylinders, the hydraulic control valve, main relief valve, lift arm by-pass control valve, tilt lock valve, hydraulic pump, hydraulic filter housing and reservoir. Procedures include cylinder leakage checks, removal and installation, cylinder disassembly and seal replacement, control-valve disassembly, spool and detent service, pump output testing and component inspection.

The hydraulic/hydrostatic schematic identifies system components and provides pressure and flow information. The manual includes procedures for testing the main relief valve with and without auxiliary hydraulics, checking hydraulic pump output, and diagnosing conditions such as slow hydraulic action, uneven operation, lift arms moving slowly, unwanted lift-arm movement and internal or external cylinder leakage.

Hydrostatic service includes steering linkage adjustment, hydrostatic motor and pump repair, charge-pressure testing, drive coupler service, port block service and oil cooler removal. Detailed disassembly and assembly sections cover the hydrostatic motor and tandem hydrostatic pumps, including internal inspection, seals, rotating groups, bearings, shafts, valves and motor timing. The drive-system section continues with parking brake work, axle seals, axles, bearings, sprockets, drive chains and chaincase procedures.

Chapters Covered

• Safety and Maintenance
  • Lifting and blocking the loader; lift arm support device
  • Operator cab raising, lowering and emergency exit
  • Service schedule and loader lubrication
  • Air cleaner, cooling system, fuel system and engine lubrication
  • Hydraulic/hydrostatic fluid and filter service
  • Final drive chaincase, Bob-Tach, tires, pivot pins and seat bar restraint system
  • Towing, transporting, remote start and spark arrestor muffler
• Hydraulic System
  • Hydraulic system information and troubleshooting
  • Lift and tilt cylinder checking, removal, installation and overhaul
  • Main relief valve testing
  • Hydraulic control valve removal, disassembly and inspection
  • Lift arm by-pass and tilt lock valves
  • Hydraulic pump output testing, removal and overhaul
  • Hydraulic filter housing and fluid reservoir
  • Hydraulic/hydrostatic schematic
• Hydrostatic System
  • Hydrostatic troubleshooting and replenishing-valve function
  • Control panel and steering linkage
  • Steering linkage neutral adjustment
  • Hydrostatic motor removal, disassembly, inspection and timing
  • Port block, oil cooler by-pass and temperature switch
  • Hydrostatic pump charge-pressure testing
  • Hydrostatic pump removal, drive coupler service and overhaul
  • Oil cooler removal and installation
• Drive System
  • Parking brake and traction lock guides
  • Axle seal removal and installation
  • Axle, bearing and sprocket service
  • Drive chain removal and installation
  • Chaincase covers and chaincase oil service
• Main Frame
  • Seat bar removal and component service
  • Operator cab and gas cylinder service
  • Operator seat and seat belt
  • Bob-Tach removal, lever and wedge service
  • Lift arm removal and installation
  • Rear grill and rear door service
  • Fuel tank and fuel level sender
  • Control pedal and interlock linkage adjustment
• Electrical System
  • Electrical system information, fuses, relays and troubleshooting
  • Wiring schematics and optional-equipment wiring
  • Battery and booster-battery procedures
  • Alternator testing, disassembly and component checks
  • Starter testing, disassembly, inspection and repair
  • Instrument panel and lights
  • BICS™ System Controller troubleshooting
  • BICS™ system inspection with Press To Operate Button
  • Seat bar sensor testing and controller circuit test
  • Traction lock troubleshooting and service
• Engine Service
  • Air cleaner, blower fan housing, radiator and muffler
  • Engine removal and mounting brackets
  • Compression checking and glow plug testing
  • Fuel lift pump, injection pump and injector nozzles
  • Fuel injection pump timing
  • Valve clearance adjustment
  • Engine speed control and governor adjustments
  • Flywheel and ring gear
  • Engine reconditioning including cylinder head, valves, pistons, connecting rods, crankshaft, camshaft, timing gears, oil pump and water pump
• Specifications
  • Loader dimensions, performance and controls
  • Engine, hydraulic, electrical and drive-system data
  • Fluid capacities
  • Kubota D1105-B engine specifications and service limits
  • SAE and metric bolt torque specifications
  • Hydraulic connection tightening specifications
  • Hydraulic fluid specifications
  • U.S. and metric conversions

Taken as a whole, the manual provides the working information needed to diagnose a fault, safely gain access to the affected system, test components against specified values, remove and dismantle assemblies, inspect internal parts, make adjustments and reassemble the loader using the stated procedures and torque values. It is particularly useful for work involving hydraulic cylinders and valves, hydrostatic pumps and motors, steering neutral adjustment, drive components, the BICS™ interlock system and the Kubota diesel engine.

Engine and Machine Specifications Included

The loader specifications identify a Kubota D1105-EB diesel engine with three cylinders, 68.5 cu. in. (1,1 L) displacement, 25.0 HP (18,6 kW) and a maximum governed speed of 3000 RPM. A separate engine-specification section is headed KUBOTA D1105-B and supplies detailed engine service measurements for components including the cylinder head, valves, valve springs, camshaft, cylinders, crankshaft, pistons, piston rings, oil pump, injection system and thermostat.

Machine data includes rated operating capacity, tipping load, operating weight, breakout force, hydraulic pump capacity and system relief pressure. The specification pages also cover the hydraulic cylinders, electrical system, hydrostatic 4-wheel drive, final drive, cooling-system capacity, fuel capacity, engine oil, hydraulic reservoir, hydraulic/hydrostatic system and chaincase reservoir. Hydraulic connection charts and general bolt torque tables are included for repair and reassembly work.

Electrical Schematics and BICS™ Diagnostics

Electrical coverage is more than a basic wiring diagram. The manual contains wiring schematics for the covered serial ranges, including option circuits, along with circuit-color identification, fuse and relay locations and troubleshooting information. Component sections provide alternator output and regulator testing, rotor and stator checks, starter testing and repair, battery procedures, instrument-panel service and lighting work.

The Bobcat Interlock Control System receives dedicated coverage. Technicians can follow BICS™ controller troubleshooting, inspect system functions with the engine stopped or running, test the seat bar sensor circuit, inspect traction-lock operation and check lift-arm by-pass and auxiliary-hydraulic deactivation functions. This makes the Bobcat 553 service manual useful when a machine problem involves both mechanical systems and the safety-control circuitry that enables those systems.

Repair Your Bobcat 553 with the Correct Service Information

The Bobcat 553 Skid Steer Loader Service Repair Manual 6903125 PDF supports jobs ranging from scheduled maintenance and adjustments to hydraulic testing, hydrostatic drive diagnosis, cylinder resealing, pump and motor overhaul, electrical troubleshooting, BICS™ checks, axle and chaincase repair and substantial diesel-engine reconditioning. Having the specified procedures, service limits, pressure and flow figures, torque values, wiring information and component illustrations available during the job helps reduce guesswork and provides a consistent reference for inspection and reassembly.

IMAGES PREVIEW

Delivered as an instant PDF download after payment, with no physical book and no shipping delay. The manual can be opened on compatible computers, tablets and phones and pages can be printed when a paper reference is useful at the machine or workbench.