• XT Hub Service

  • 1 hour
  • Shimano Mounting Tool (TL-FC35)

    8mm Allen Key

    Torque Wrench (with 8mm hex and 45nm setting)

  • Moderate

Words and Photos by Richard Fox - posted 30/09/2010

XT Hub Service

This maintenance article covers the M765 Hubs but essentially most of the modern XT hubs are similar but make sure you have the correct bearing sizes for the model of hub you are servicing. If in doubt check the Shimano tech docs for the model of hub you have here: Shimano Tech Docs.

What you need

  • Spanner (to fit lock ring tool) and chain whip
  • Compatible bearings - 2 x 9 x 1/4 inch steel bearings
  • Compatible bearings - 2 x 11 x 3/16 inch steel bearings
  • Cassette lock ring remover tool
  • Flat-head screwdriver
  • Grease (preferably Synthetic)
  • 15 & 17mm cone spanners
  • 10mm allen key
  • Degreaser

Optional Tools

  • Torque wrench (45nm setting)

Disassembly

Firstly remove the rear wheel and remove the quick release.

XT Hub Service

Hold a sprocket in clockwise direction with sprocket chain whip tool. Turn remover counter-clockwise, using a large adjustable or socket wrench (may require moderate force or an extension to the wrench handle) and remove the cassette.

XT Hub Service

Lock ring removed

XT Hub Service

Cassette removed.

XT Hub Service

Turn the wheel around and prise off the rubber seal.

XT Hub Service

Using both the 15 and 17mm cone spanners you need to remove the lock nut from the non-drive side. Remove any spacers and washers and remove the cone as shown below.

XT Hub Service

Remember what order the washers, lock nuts and cones are in before you take apart. Also do not allow the axle to slip through otherwise the bearings may fall out (not a problem if you are going to replace them).

XT Hub Service

Place them all in order (helps when reassembling).

XT Hub Service

Cone removed to expose mucky bearings.

XT Hub Service

Remove the axle but as the bearings are loose use a flat bladed screw driver of a pen magnet to remove them from the cups. There should be 9 bearings each side (1/4 inch) but depends on the model of hub. place again in order of disassembly.

XT Hub Service

Axle removed, bearings still present embedded in gunk!

XT Hub Service

Bearings removed.

XT Hub Service

Use a 10mm allen key to undo the internal bolt inside the freehub. This will remove the freehub.

XT Hub Service

Picture showing the freehub body and the bolt. There is also a slotted spacer between back of the freehub body and hub.

XT Hub Service

Freehub body removed showing the splined fitting on the hub.

XT Hub Service

Picture showing the slotted spacer.

XT Hub Service

Basic Freehub Body Service

You can't disassemble the freehub body but you can clean it and re-grease it (or buy a new one). Firstly remove the seal with a braddle or similar.

XT Hub Service

This exposes the bearings. Next you can drop it into a pot of solvent. If the pot has a lid then you can shake it to strip it of grease and mud and grit. Change the solvent a few times then allow to dry. Then inject grease into the bearings and keep turning and injecting until you can feel the grease getting into the ratchet mechanism inside. Clean and replace the seal.

XT Hub Service

Reassembly

Replace the freehub body washer.

XT Hub Service

Replace the freehub body and bolt and tighten with the 10mm allen key. Next replace the 9 1/4 inch ball bearings, preferably with new ones.

XT Hub Service

The easiest way is to place the grease in first and place each bearing into the grease, turning the wheel as you add them.

XT Hub Service

Do this both sides and then replace the axle from the drive side. I usually place a bit more grease in at this point.

XT Hub Service

Replace the cone, spacers and locknut in the right order and then tighten with the cone spanners. This takes a bit of time to get the right compression on the bearings. The axle should not rattle i.e. the cones should be tight on the bearings, but not too tight that they grind when the axle is turned (bit like doing up a headset).

XT Hub Service

Replace the dust seal making sure its seated properly behind the washer behind the locknut.

XT Hub Service

Grease the splines on the freehub body.

XT Hub Service

Replace the cassette and tighten the lockring with the tool and wrench/spanner to the correct torque (45nm usually).

XT Hub Service

Front Hub Service

This is the easiest wheel to service and usually does not need to be as frequent as the rear. Essentially is similar to the rear but both sides have a similar cup and cone config. I would remove the cone/lockring from the non-disc side as its easier to get the cone spanners in. The dust seal is first removed.

XT Hub Service

Use the cone spanners as before to remove the lock ring.

XT Hub Service

The cone is longer on the front but essentially the same.

XT Hub Service

Remove the axle and bearings, then clean the cups, regrease, reload bearings then insert axle, assemble cone, washers and lockring and tighten as before. Replace the dust seal. the front bearings on this model requires 11 3/16 diameter bearings on each side. Replace QR then your finished.

Richard Fox - Web Editor

Richard Fox

Richard has been mountain biking for over 18 years, 8 years on his local trails, Dartmoor. He also regularly rides away from home – usually riding each year (while doing the mechanics for others) in various events such as the Bristol Bikefest series, Dyfi Enduro and twentyfour12 and a fair few others.

He is also a secret roadie and participates in many sportives including his local Dartmoor Classic 100 and Endura Lionheart to name but a few - Shhhh

All these years of riding (and breaking) bikes, has resulted in Richard acquiring the wealth of experience (and the tools) to keep his, and inevitably all his riding crew's, bikes on the trails.

He also completed John O'Groats to Lands End road ride for charity in 8 days in 2012

Richard is the Cyclist No.1 Web Editor.


Maintenance in association with Cycle System Acadmey...

Cycle Systems Academy offers a range of courses, from one day introductory courses in Basic Maintenance, specialist courses such as Brompton Servicing, or learning how to strip out and repair Sturmey Archer Hubs, right through to professional industry training in Level Two and Level Three qualifications recognised and accredited by the Government Qualification and Credit Framework.

Cyclist No.1 has teamed up with Cycle Systems Academy to provide maintenance guides for the home mechanic.

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