Dana Spicer 21D Heavy Planetary Rigid Industrial Axle Service Manual – ASM-0102

Description

Dana Spicer 21D Heavy Planetary Rigid Axle Service Manual

This is the full Dana Spicer 21D industrial axle service manual, published under document number ASM-0102 for the Heavy Planetary Rigid 21D. Across 104 pages it takes a technician from the axle assembly itself right down to the planetary wheel ends, the differential carrier, the trunnion supports, and the liquid-cooled brake packs. Every major repair is laid out as a photographed procedure, and the torque values, backlash figures, preload targets, and lubricant recommendations needed to complete each job correctly are woven into the steps rather than tucked away in a separate section.

File Details

• Manual type: Industrial axle service and repair manual
• Brand: Dana / Spicer
• Model covered: Heavy Planetary Rigid 21D
• Document number: ASM-0102
• Publisher: Dana Holding Corporation
• Copyright: 2010
• Language: English
• Page count: 104 pages
• File format: PDF

Chapters Covered

• Introduction — Foreword, Safety Precautions, Description, Exploded Views
• Axle Assembly
• Differential and Carrier Assembly
• Posi-Stop (LCB) Brake
• LCB Brake Trunnion
• Planetary Assembly
• Pinion Brake
• Installation Diagrams — Axle Assembly, Posi-Torque, Standard and No-Spin Differential and Carrier Assembly, Pinion Brake Installation and Adjustment
• Lubrication — Recommended Lubricants, Oil Grades by Temperature Range, Liquid-Cooled Brake (LCB) Lubricants, Checking the Oil Level, Draining the Axle Center and Wheel Ends, Draining Liquid-Cooled Brakes, Bearing Heating and Freezing Guidelines, Gear Tooth Contact (Left-hand and Right-hand)
• Hardware Installation and Torque Specs — Applying Thread Locking Compound, Wheel Mounting Torque, Torque Specifications
• Disassembly — Getting Started, Planetary Removal, Hub Removal, Face Seal Removal, Brake and Spindle Removal, Differential Removal, Differential Disassembly, Standard / No-Spin / Posi-Torque Differential Case Half Disassembly, Planetary Disassembly, Planetary Ring Gear Disassembly, LCB Brake Disassembly, Posi-Stop (LCB) Brake Disassembly
• Cleaning and Inspection
• Reassembly — Planetary Reassembly, Planetary Ring Gear Reassembly, LCB Brake Reassembly, Posi-Stop (LCB) Brake Reassembly, Spindle and Brake Installation, Face Seal Installation, Hub Installation, Posi-Stop Brake Installation, Wheel Bearing Preload Adjustment, Pinion Shaft & Bearing Cage Reassembly, Differential Case Reassembly (Standard, No-Spin, Posi-Torque), Ring Gear to Pinion Mounting Distance Procedure, Carrier Installation, Planetary Installation
• Axle Wheel End Air Pressure Test
• Axle Center Section Air Pressure Test
• Tools — Brake Spring Compression Tool, Wheel Hub and Brake Lifting Tool, Brake Piston Pressure Ring Lifting Tool, Hub Seal Driver Tool

What ties the Dana Spicer 21D Heavy Planetary Rigid axle service manual together is the way it moves between systems. A single repair often touches the differential, the planetary reduction in the wheel hub, and the liquid-cooled brake pack at the same time, and the manual is written with that reality in mind. You get the primary spiral bevel reduction, the secondary planetary reduction, the internal ring gear and carrier assemblies, the standard, No-Spin, and Posi-Torque differential variants side by side, and both styles of liquid-cooled brake — the hydraulically applied LCB and the spring-applied Posi-Stop LCB — documented at the same level of detail. Trunnion support service, face seal handling, wheel bearing preload adjustment, pinion mounting distance measurement with a setting gauge, and the air pressure tests used to prove out the wheel ends and center section after assembly are all included.

Inside the Dana Spicer 21D Heavy Planetary Rigid 21D Workshop Manual

The disassembly chapters are built around real photos of the axle on a repair stand, with call-outs for the lifting equipment, puller screws, and supporting hardware you need at each step. The differential case work separates into three case-half procedures — Standard, No-Spin, and Posi-Torque — so you follow the exact variant fitted to your axle rather than a generic description. The LCB and Posi-Stop brake sections go deep on piston removal and installation, seal ring fitment, slack adjuster setting, wear indicator pin handling, and the pressure and hydraulic tests that confirm a correct rebuild. Torque tables cover standard and metric fasteners, O-ring plugs, pipe plugs, and elastic stop nuts, with wheel mounting torque sequences printed as separate charts for flat nuts, rim clamps, and spherical nuts.

Jobs This Manual Supports

• Full axle removal from the machine and reinstallation
• Planetary carrier and ring gear teardown and rebuild
• Differential case service for Standard, No-Spin, and Posi-Torque variants
• Ring and pinion mounting distance setup using a pinion setting gauge
• Differential bearing preload and ring gear backlash adjustment
• LCB brake piston, disc, and seal overhaul with air and hydraulic pressure testing
• Posi-Stop (LCB) brake teardown, spring set handling, and slack adjuster adjustment
• Spindle, hub, face seal, and wheel bearing preload work
• Trunnion support bushing, thrust washer, and wiper seal service
• Lubricant selection by ambient temperature and correct drain/fill procedures

For anyone maintaining a Dana Spicer 21D industrial planetary axle, the value here is precision. Torque values, backlash windows, bearing preload ranges, mounting distance figures, and seal seating checks are what stop a rebuild from turning into a repeat repair. Working from a general axle manual, or from memory, is exactly how bearing preloads drift, ring gears run noisy, and brake packs fail their pressure tests. The Dana 21D service manual gives you the actual numbers Dana specifies, alongside the sequence photos that show you what the correct assembly looks like before you commit to tightening anything down.

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Instant PDF Delivery

The manual is delivered as an instant PDF download after payment — nothing ships and nothing is printed. Open it on a laptop, tablet, or phone in the workshop, zoom into the photos and exploded views, and print only the pages you need for the job in front of you. Whether you are servicing a single axle in a repair bay or maintaining a fleet of heavy planetary rigid 21D units, this Dana Spicer ASM-0102 service manual puts the complete factory-level procedure set within arm’s reach.