Bobcat S650 Skid-Steer Loader Service Manual – 6990746enUS

Description

Bobcat S650 Skid-Steer Loader Service Manual – 6990746enUS

The Bobcat S650 Skid-Steer Loader Service Manual – 6990746enUS is the complete workshop guide designed for mechanics, technicians, and equipment owners carrying out maintenance, troubleshooting, and complete system overhauls. Covering machines within serial number ranges ALJ811001 & Above, S1ML11001 & Above, and B2LA11001 & Above, this manual provides factory-grade technical data, step-by-step assembly and disassembly procedures, tightening specifications, and hydraulic schematics for standard and high-flow configurations.

File Details

• Manual Type: Workshop Service Manual
• Brand: Bobcat
• Model: S650 Skid-Steer Loader
• Applicable Serial Numbers: S/N ALJ811001 & Above, S/N S1ML11001 & Above, S/N B2LA11001 & Above
• Publication Number: 6990746enUS (10-18) (G)
• Publication Date: October 2018
• Language: English
• Page Count: 1170
• File Format: PDF

Chapters & Sections Covered

• Safety & Maintenance: Safe lifting and blocking procedures; lift arm support device installation and removal; operator cab (ROPS/FOPS Level I and II) raising, lowering, and hardware torquing; cab door sensor operation; Special Applications Kit and Forestry Door/Window Kit inspection and cleaning; trailer transport and tie-down locations; towing precautions; Remote Start Tool Kits (MEL1563, MEL1566 harness communicator, and 7217666 service tool kit); scheduled maintenance intervals from 10-hour checks to 1500-hour coolant replacement; dual-element air cleaner servicing; engine cooling system maintenance and radiator/cooler cleanout; propylene glycol coolant draining and refilling; fuel system requirements (Ultra Low Sulfur Diesel ASTM D975, EN590, and B5/B7 biodiesel considerations), fuel filter replacement, and system bleeding; engine lubrication requirements (API CJ-4 / ACEA E9), drain hose routing, and filter replacement; hydraulic/hydrostatic reservoir checking, fluid replacement, main canister filter, charge filter, and breather cap servicing; final drive chaincase fluid levels and draining; Bob-Tach (hand lever and Power Bob-Tach) wedge engagement and inspection; machine grease lubrication points; tire maintenance, rotation, and wheel nut torquing (217 N•m / 160 ft-lb); pivot pin inspection (48–54 N•m / 35–40 ft-lb); machine storage and return-to-service protocols; emergency exits (rear window removal via latches or rubber pull cord, front door release); and seat belt inspection.
• Hydraulic System: Full glossary of hydraulic and hydrostatic ISO schematic symbols; complete hydraulic diagnostic troubleshooting guide; lift cylinder testing, removal, teardown, rebuild, piston nut torquing (1491 N•m / 1100 ft-lb), and gland nut assembly (373 N•m / 275 ft-lb); tilt cylinder testing, removal, pivot pin extraction, parts identification for earlier and later production, piston repacking, and nut torquing (1152 N•m / 850 ft-lb earlier, 1491 N•m / 1100 ft-lb later); Power Bob-Tach hydraulic cylinder testing, removal, and overhaul (190 N•m / 140 ft-lb piston nut torque); main relief valve testing with pressure gauge MEL1355-3, pressure adjustment (24132 kPa / 3500 psi standard; 25511–26200 kPa / 3700–3800 psi with auxiliary relief), and cartridge replacement; auxiliary relief valve adjustment (23787–24476 kPa / 3450–3550 psi); Standard Hydraulic Control Valve complete teardown, load check valves, anti-cavitation valves, port relief valves (27579 kPa / 4000 psi), spool centering blocks, detent sleeve orientation (radius vs. vertical lift pattern), centering spring assembly, auxiliary pilot solenoids, BICS lock valves, and bypass orifice; Advanced Control System (ACS) and Selectable Joystick Control (SJC) control valve configurations, actuator removal and replacement (in-machine and bench), actuator linkage pins, and calibration notices.
• Hydraulic & Hydrostatic Schematics: Full-page engineering circuit schematics with detailed legends covering Manual Controls with No Options, Manual Controls with All Options (across serial breakpoints ALJ811001–ALJ813901, ALJ813902–ALJ819181, ALJ819182 & Above, B2LA11001–B2KZ11042, B2LA11043–B2LA11457, B2LA11458 & Above), SJC with No Options, and SJC with All Options (incorporating High Flow pump circuits, 2-Speed & SAPR brake valve, reversing fan motor, ride control accumulator, and bucket positioning valves).

Together, these comprehensive chapters equip service personnel with exact factory disassembly sequences, component identification charts, diagnostic pathways, and factory torque limits required to perform repairs safely and accurately on the Bobcat S650 loader.

Preventative Maintenance & Machine Servicing

Routine service intervals detailed in the Bobcat S650 Skid-Steer Loader Service Manual – 6990746enUS ensure maximum uptime and operational safety. Detailed procedures guide you through every critical checkpoint, including checking fluid levels, purging air from fuel lines via the priming bulb, and properly servicing both inner and outer air cleaner elements based on instrument cluster service codes ([AIRF] and [M0117]). The manual highlights essential cooling system requirements, specifying factory-filled propylene glycol mixtures (47% water and 53% propylene glycol providing freeze protection down to -37°C / -34°F) to avoid catastrophic mixing with ethylene glycol formulations.

Technicians working on shop diagnostics benefit from complete instructions on utilizing specialized tools, including the MEL1563 Remote Start Tool and the 7217666 Service Tool Kit. These tools allow mechanics to start the machine, override traction lock systems, and operate auxiliary hydraulics safely with the operator cab raised during linkage adjustments, electrical testing, and pressure diagnostics.

Hydraulic Cylinder Rebuilding & Control Valve Overhaul

Hydraulics form the core of the S650 skid-steer loader, and this workshop manual provides deep component-level servicing details. Mechanics will find complete procedures for testing lift and tilt cylinders for internal bypass leaks before performing teardown. Step-by-step rebuilding sequences detail the use of specialized seal expanders (MEL1396-1), piston ring compressors (MEL1396-2), and gland nut spanner tools (MEL1075).

The manual provides explicit torque benchmarks, requiring 1491 N•m (1100 ft-lb) on the lift cylinder piston nut and 373 N•m (275 ft-lb) on the cylinder head. For the main hydraulic control valve, detailed cross-sectional layouts show the placement of all internal components—from the lift circuit detent mechanism to the Bobcat Interlock Control System (BICS) solenoids and lock valves. Resistance values for electronic solenoid coils (16.02–19.58 ohms for spool lock solenoids; 5.1 ohms for auxiliary proportional coils; 9.5–10.08 ohms for general coils) allow electrical faults to be pinpointed immediately.

Complete Technical Schematics & Relief Valve Settings

Accurate pressure diagnostics require precise baselines. This manual supplies exact factory settings across all circuits: main relief pressure of 24132 kPa (3500 psi) at the front quick couplers, secondary main relief setting of 25511–26200 kPa (3700–3800 psi) on models equipped with an auxiliary relief valve, charge inlet pressure of 3034 ± 344 kPa (440 ± 50 psi) on manual machines and 3413 ± 172 kPa (495 ± 25 psi) on SJC machines, port relief valves at 27579 kPa (4000 psi), and hydrostatic high-pressure replenishment valves set at 36500 kPa (5294 psi).

Clear schematics trace circuit flows across standard flow, optional high-flow gear pumps (28.4 L/min / 7.5 U.S. gpm), spring-applied pressure-release (SAPR) brake systems, two-speed transmission directional valves, and automatic ride control accumulators.

Professional Equipment Servicing at Your Fingertips

The Bobcat S650 Skid-Steer Loader Service Manual – 6990746enUS delivers the detailed technical foundation required to diagnose complex hydraulic failures, perform preventative maintenance schedules, and overhaul key mechanical systems with confidence. Having factory-accurate assembly instructions, exact bolt torques, and true schematic paths protects expensive hydraulic and hydrostatic components against improper adjustments and premature failure.

Delivered as an instant PDF download, this manual provides immediate digital access without shipping delays or backorders. Compatible with Windows, macOS, Android, iOS, and Linux devices, the file allows you to zoom in on intricate hydraulic diagrams in the shop, carry troubleshooting checklists directly to the job site on a mobile tablet, or print clean working pages whenever hands-on repairs begin.