Demco 21K Autoslide 6107 Fifth-Wheel Hitch Exploded Parts Guide

Demco's 21K Autoslide is the 6107 automatic sliding fifth-wheel hitch body. The complete hitch part number identifies whether it uses industry-standard bed rails or a factory pickup-bed prep package. The maker's illustrated 6107 parts list identifies the guide system, rollers, main gear assembly and head support as separate service components.

See the Demco hitches and accessories

Select a photograph to open its matching NewRVParts listing. The adapter plates and optional pin-box wedge are separate products, not substitutes for a complete hitch.

Demco 21K Autoslide above-bed, rails separate (Demco 8550035), product listing photograph8550035 — Demco 21K Autoslide above-bed, rails separate21K above-bed mount without bed railsDemco 21K Autoslide with industry-standard rails (Demco 8550036), product listing photograph8550036 — Demco 21K Autoslide with industry-standard rails21K above-bed mounting with rails includedDemco 21K Autoslide for Ram OEM pucks (Demco 8550062), product listing photograph8550062 — Demco 21K Autoslide for Ram OEM pucks21K hitch with Ram factory-puck mounting platesDemco 21K Autoslide for GM factory pucks (Demco 8550063), product listing photograph8550063 — Demco 21K Autoslide for GM factory pucks21K hitch for matching Chevrolet and GMC factory prepDemco 21K Autoslide for Ford factory pucks (Demco 8550038), product listing photograph8550038 — Demco 21K Autoslide for Ford factory pucks21K Ford factory fifth-wheel prep variantDemco Autoslide ISR side adapter plates (Demco 6003), product listing photograph6003 — Demco Autoslide ISR side adapter platesIndustry-standard rail-side adapter kit with hardware

Demco's original 21,000 lb Autoslide — core assembly 6107 parts drawing

The manufacturer's exploded drawing shows the numbered mechanical components. The original PDF can be enlarged to read part labels and see their positions.

View the original Demco parts drawing

Open the PDF separately to enlarge the diagram and check the numbered components.

Open the 21,000 lb Autoslide — core assembly 6107 parts diagram (PDF, page 11) · View the hitch-head parts drawing

Manufacturer parts identified in the drawing

Callouts are from Demco's illustrated service reference. Unlinked internal components are not represented as independently stocked items.

Callout Demco part number Component
13 11337-95 Pivot hinge bushing
16 14221 Lynch pin
17 14222-95 Main pivot pin
18 14319 Upper bearing
21 14707-72 Guide tube
22 14708-72 Guide-tube support
23 14711 Slide wear plate
24 14712 Gear rack
27 14985-95 Guide roller
28 15159-95 Spacer bushings
29 15769 Urethane pivot bumpers
30 15778 Fifth-wheel head yoke
31 16235 25 mm bushing
32 16845 Large-dome rivets
33 17825-72 21K main gear assembly
34 17827-72 Upper slide assembly
35 18329-72 21K main frame
36 6018 Outrigger bar

Choose the mounting package

The core hitch and bed-mount components are supplied in different combinations. Select the exact manufacturer's complete-kit number for the truck's fifth-wheel mounting system.

Complete kit What's included
8550035 6107 hitch + 6003 ISR adapter plates; bed rails separate
8550036 6107 hitch + 6003 ISR adapters + 6071 bed rails
8550062 6107 hitch with 6401 Ram factory-puck adapter plates
8550063 6107 hitch with 6402 GM factory-puck adapter plates
8550038 6107 hitch with Ford factory-prep adapter system
This 21K model uses 14 inches of automatic slide travel. Its 6107 body has the 17825-72 main gear assembly in the referenced service drawing; the 18K model has a separately numbered 17824-72 gear assembly. Check the hitch nameplate and serial number before ordering an internal replacement. Choosing a Ram, Ford, Chevrolet/GMC or industry-standard-rail variant depends on the truck's actual preparation package, not simply its make.

Before replacing components or towing

The full tow rating is limited by the lowest-rated component in the truck, hitch, rail and trailer combination. A fifth-wheel Autoslide can increase cab clearance but does not guarantee a 90-degree turn. Follow Demco's instructions for capture-plate positioning, locking plates on applicable pin boxes, coupling checks and routine wear inspection.

Use the current Demco instructions and verify the hitch serial number when obtaining replacement parts or servicing the coupling, slide mechanism or mounting system.

Original manufacturer instructions

Demco 21K Autoslide model rangeDemco 21K above-bed kit detailsDemco 6107 factory illustrated parts guide

Other Autoslide parts references

Save on Parts & Accessories

Sign up for special offers, new product updates, and deals on RV, truck camper, towing, truck, and marine parts and accessories.

About NewRVParts

NewRVParts is an online-only source for brand-new RV parts and accessories, truck camper equipment, towing and trailer parts, truck accessories, and marine products. We serve customers throughout Canada and the United States, with products from trusted manufacturers shipped through a large North American distribution network. Shop online for replacement parts, equipment, and accessories delivered directly to your door.

Shop RV Parts