{"product_id":"komatsu-870b-motor-grader-sn-202599-up-service-repair-workshop-manual","title":"Komatsu 870B Motor Grader SN 202599 UP Service Repair Workshop Manual","description":"\u003cp\u003e\u0026lt;h3\u0026gt;Komatsu 870B Motor Grader -- SN 202599 and Up\u0026lt;\/h3\u0026gt; \u0026lt;p\u0026gt;The Komatsu 870B motor grader is a robust earthmoving and road maintenance machine that served as the predecessor to the current 870C model. Motor graders like the 870B are essential equipment on any road construction site -- they cut, spread, and finish aggregate and soil to precise grade tolerances, establish drainage cross-slopes on existing roads, cut drainage ditches in highway corridors, back-blade road shoulders, and mix in-place soil stabilization materials. The 870B model, particularly units with serial number 202599 and higher, incorporates factory-refined hydraulic controls, improved operator visibility from the cab design, and updated emissions-control components over earlier 870B production runs.\u0026lt;\/p\u0026gt; \u0026lt;p\u0026gt;The 870B is powered by a heavy-duty turbocharged Komatsu diesel engine selected for its high torque output at low to mid RPM ranges. This torque-rich powerband is essential for a grader's primary function -- pulling a heavy, loaded moldboard through challenging material at controlled ground speeds. The power shift transmission provides multiple forward and reverse gear ratios selected under load without clutch input, allowing operators to shift between transport speeds on hard surfaces and slow, precise grading speeds at full engine power without stopping the machine. Komatsu's sealed and lubricated track-style undercarriage knowledge translates to their motor grader rear tandem designs, with planetary final drives that deliver reliable service in the abrasive dirt and dust conditions that define grader operating environments.\u0026lt;\/p\u0026gt; \u0026lt;p\u0026gt;Motor graders require skilled operators and knowledgeable technicians. The blade control system alone involves multiple hydraulic circuits that must respond to operator input with precision measured in fractions of an inch when performing fine-grading work. The articulated frame steering system needs proper cylinder sealing and accumulator pre-charge to maintain the responsive feel operators rely on when shaping road surfaces. This factory service manual addresses every system on the 870B with the same depth of detail Komatsu service technicians use -- ensuring your maintenance teams can diagnose hydraulic leaks, transmission performance issues, blade positioning faults, and engine concerns before they become downtime-producing failures.\u0026lt;\/p\u0026gt; \u0026lt;h3\u0026gt;SERVICE \u0026amp; REPAIR SCOPE\u0026lt;\/h3\u0026gt; \u0026lt;ul\u0026gt; \u0026lt;li\u0026gt;\u0026lt;strong\u0026gt;Engine Service:\u0026lt;\/strong\u0026gt; Komatsu diesel engine removal and installation, turbocharger boost pressure testing, fuel injection timing verification, fuel system air bleed procedure, cylinder head valve overlap clearance, oil pump replacement, cooling system flush and coolant specification, and all scheduled maintenance procedures with service interval tables.\u0026lt;\/li\u0026gt; \u0026lt;li\u0026gt;\u0026lt;strong\u0026gt;Power Shift Transmission:\u0026lt;\/strong\u0026gt; Complete transmission removal, clutch pack clearance measurement, transmission control valve body disassembly, clutch apply piston seal kit installation, planetary ring and sun gear inspection, and oil specification for transmission housing.\u0026lt;\/li\u0026gt; \u0026lt;li\u0026gt;\u0026lt;strong\u0026gt;Articulated Steering System:\u0026lt;\/strong\u0026gt; Frame hinge joint pivot bushing wear measurement, steering cylinder rod end bearing replacement, steering accumulator nitrogen pre-charge test and adjustment, steering pump flow rate measurement, and priority valve function testing.\u0026lt;\/li\u0026gt; \u0026lt;li\u0026gt;\u0026lt;strong\u0026gt;Blade Control Hydraulics:\u0026lt;\/strong\u0026gt; Circle drive motor seal kit installation, circle bearing race inspection, moldboard side shift cylinder rebuild, blade angle cylinder seal replacement, pitch cylinder service, all blade control hydraulic hose inspection, and hose fitting torque specifications.\u0026lt;\/li\u0026gt; \u0026lt;li\u0026gt;\u0026lt;strong\u0026gt;Front Mounted Equipment:\u0026lt;\/strong\u0026gt; Front blade \/ scarifier if equipped, front dozer attachment mounting, auxiliary hydraulic connection service, quick-coupler inspection and replacement.\u0026lt;\/li\u0026gt; \u0026lt;li\u0026gt;\u0026lt;strong\u0026gt;Hydraulic System:\u0026lt;\/strong\u0026gt; Main hydraulic pump pressure and flow testing, multi-section control valve spool inspection, relief valve setting verification, hydraulic reservoir cleaning procedure, filter element change, hydraulic fluid sampling for contamination analysis, and system bleeding protocol after component replacement.\u0026lt;\/li\u0026gt; \u0026lt;li\u0026gt;\u0026lt;strong\u0026gt;Service Brakes \u0026amp; Parking Brake:\u0026lt;\/strong\u0026gt; Service brake disc thickness measurement, brake caliper rebuild, parking brake adjustment cable stretch compensation, and brake system flush and bleed with Komatsu-specified fluid.\u0026lt;\/li\u0026gt; \u0026lt;li\u0026gt;\u0026lt;strong\u0026gt;Electrical System:\u0026lt;\/strong\u0026gt; Alternator output under load testing, starter motor disassembly and inspection, wiring harness continuity testing with pin-out specifications, operator monitor panel diagnostic mode, and warning lamp circuit troubleshooting.\u0026lt;\/li\u0026gt; \u0026lt;li\u0026gt;\u0026lt;strong\u0026gt;Axle \u0026amp; Final Drive:\u0026lt;\/strong\u0026gt; Rear tandem axle inspection, planetary final drive disassembly, bearing cone and cup replacement, axle shaft seal replacement, and axle housing oil specification.\u0026lt;\/li\u0026gt; \u0026lt;li\u0026gt;\u0026lt;strong\u0026gt;Cab \u0026amp; Operator Station:\u0026lt;\/strong\u0026gt; Cab spring and mount replacement, HVAC system service, defroster function, windshield wiper motor replacement, operator seat air\/magnetic suspension rebuild, and cab door weatherstrip replacement.\u0026lt;\/li\u0026gt; \u0026lt;\/ul\u0026gt; \u0026lt;h3\u0026gt;TECHNICAL SPECIFICATIONS\u0026lt;\/h3\u0026gt; \u0026lt;p\u0026gt;\u0026lt;strong\u0026gt;Model:\u0026lt;\/strong\u0026gt; Komatsu 870B Motor Grader\u0026lt;br\u0026gt; \u0026lt;strong\u0026gt;Serial Numbers:\u0026lt;\/strong\u0026gt; 202599 and UP\u0026lt;br\u0026gt; \u0026lt;strong\u0026gt;Engine:\u0026lt;\/strong\u0026gt; Komatsu turbocharged diesel\u0026lt;br\u0026gt; \u0026lt;strong\u0026gt;Transmission:\u0026lt;\/strong\u0026gt; Power Shift, multiple speed ranges\u0026lt;br\u0026gt; \u0026lt;strong\u0026gt;Steering:\u0026lt;\/strong\u0026gt; Articulated frame, full hydraulic\u0026lt;br\u0026gt; \u0026lt;strong\u0026gt;Blade:\u0026lt;\/strong\u0026gt; Hydraulic circle drive with angle, pitch, and side shift\u0026lt;br\u0026gt; \u0026lt;strong\u0026gt;Hydraulics:\u0026lt;\/strong\u0026gt; Open-center or load-sensing (configuration dependent)\u0026lt;\/p\u0026gt; \u0026lt;h3\u0026gt;DIAGNOSTIC INFORMATION\u0026lt;\/h3\u0026gt; \u0026lt;p\u0026gt;Diagnostic procedures begin with operator symptom review and advance through Komatsu's standardized testing methodology. Hydraulic circuit testing uses designated pressure test port locations with factory-specified pressure ranges for each function under load and no-load conditions. Electrical diagnostics include pin voltage and resistance measurements for all sensors and switches with expected-value tables for pass\/fail determination. The manual provides symptom-to-diagnosis flowcharts for the most common grader operator complaints including blade positioning error, hydraulic oil overheating, transmission shift harshness, and steering wander.\u0026lt;\/p\u0026gt; \u0026lt;h3\u0026gt;ILLUSTRATIONS \u0026amp; DIAGRAMS INCLUDED\u0026lt;\/h3\u0026gt; \u0026lt;p\u0026gt;Complete sectional assembly drawings for the power shift transmission, hydraulic pump body, circle drive mechanism, and steering cylinder. Full hydraulic circuit schematics showing all valve sections, relief ports, and test connection points. Electrical wiring diagrams with connector identification numbering and wire route maps. Moldboard and blade assembly exploded view showing all mounting hardware and adjustment linkages.\u0026lt;\/p\u0026gt; \u0026lt;h3\u0026gt;COMPATIBILITY\u0026lt;\/h3\u0026gt; \u0026lt;p\u0026gt;This factory service manual applies to the Komatsu 870B Motor Grader with serial numbers 202599 and higher. Not intended for the earlier 870A model, or for the subsequent 870C model (requires its own manual), or for models in the 830\/850 size class. Some procedures and specifications may vary between market-specific emissions configurations.\u0026lt;\/p\u0026gt; \u0026lt;h3\u0026gt;FILE PROPERTIES\u0026lt;\/h3\u0026gt; \u0026lt;p\u0026gt;High-quality searchable PDF document in English. Instant digital download. Accessible from any device in the field shop or remote job site. Print individual procedures for technician work stations. Full-text search locates any specification or diagnostic procedure instantly.\u0026lt;\/p\u0026gt;\u003c\/p\u003e","brand":"Manual","offers":[{"title":"Default Title","offer_id":50513858166844,"sku":"176751","price":16.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0615\/4489\/0428\/files\/176751-komatsu-870b-motor-grader-sn-202599-and-up-service-manual-pdf-download.jpg?v=1790252969","url":"https:\/\/e-manual.com\/products\/komatsu-870b-motor-grader-sn-202599-up-service-repair-workshop-manual","provider":"e-Manual Online Workshop Manuals","version":"1.0","type":"link"}