BMW AG Motorcycle (K1100LT, K1100RS). Manual - part 25

31.1

Inhalt

Seite

31

Technical Data

............................................................................................................................... 3

Removing telescopic fork 

........................................................................................................5

Removing fork stabilisor

 ..............................................................................................................5

Removing telescopic fork without fork bridge

 ...................................................................5

Removing telescopic fork with fork bridge

 ..........................................................................5

Removing upper fork bridge  ................................................................................................................5

Removing and installing lower taper roller bearing

 ..........................................................6

Removing taper roller bearing  .............................................................................................................6
Installing taper roller bearing  ...............................................................................................................6

Removing and installing upper taper roller bearing

 .........................................................6

Removing taper roller bearing  .............................................................................................................6
Installing taper roller bearing  ...............................................................................................................6

Removing and installing bearing outer race in steering head

 .....................................7

Removing bearing outer race  ..............................................................................................................7
Installing bearing outer race  ................................................................................................................7

Measuring telescopic fork

 ...........................................................................................................8

Checking lower fork bridge  .................................................................................................................8
Checking parallel alignment of fixed tubes  ..........................................................................................9
Checking runout of fixed tube  ...........................................................................................................10

Disassembling telescopic fork 

............................................................................................11

Removing fixed tube

 ....................................................................................................................11

Disassembling slider tube

 .........................................................................................................11

Disassembling fixed tube

 ..........................................................................................................12

Assembling telescopic fork 

..................................................................................................14

Assembling fixed tube

 ................................................................................................................14

Assembling slider tube

 ...............................................................................................................16

Installing telescopic fork 

........................................................................................................17

Adjusting steering bearing play

 ..............................................................................................18

Installing fork stabilisor

 ...............................................................................................................19

31 Front fork

31.2

31.3

31

Technical Data

K 1100 LT

K 1100 RS

Front wheel castor

mm (in) 95 (3.74)

Steering angle

° 34

Spring travel (normal position, 75 kg load)

mm (in) 135 (5.315)

Test installation length of fixed tubes

mm (in) ca. 210 (approx. 8.268)

Fixed tube surface

hart verchromt

Fixed tube outside ø

mm 41.7 f

8 

Slider tube inside ø

mm 41.86 H

8

Clearance of fixed fork tube in slider tube

mm (in) 0.05...0.209 (0.00197...0.00823)

Maximum permissible runout of 
fixed fork tube

mm (in) 0.15 (0.0059)

Length of fork support spring

mm (in) 425 (16.732)

Coil wire diameter of fork support spring

mm (in) 4.8 (0.189)

Telescopic fork oil - approved grade

Esso Komfort

Capacities per fork leg,

Oil change, left

right

New filling

l (Imp. pt)
l (Imp. pt)
l (Imp. pt)

0.350 - 0.01 (0.616 - 0.0176)
0.400 - 0.01 (0.704 - 0.0176)
0.400 - 0.01 (0.704 - 0.0176)

Grease in gaiter

SHELL Retinax A
Gleitmo 805

31.4

31.5

Removing telescopic fork

•

Secure lifting gear, BMW No. 00 1 510, to oil 
sump.

•

Remove fuel tank.

•

Remove front mudguard.

•

Remove brake caliper.

Removing fork stabilisor

•

Release brake distributor (1).

•

Disconnect ABS plug connection of sensor line 
(2) under fuel tank.

•

Remove fork stabiliser.

•

Remove front wheel.

•

Remove handlebar with fittings.

Removing telescopic fork without fork 
bridge

•

Release clamping screws (1,2), pull down 
telescopic fork and remove.

Removing telescopic fork with fork 
bridge

Removing upper fork bridge

•

Release hexagon nut (4).

•

Release locking tube (5).

•

Disconnect plug connection for ignition lock (3).

•

Loosen clamping screws (1).

•

Remove fork bridge.

•

Remove setting ring (6).

•

Remove fork by pulling from below together with 
light hammer blows (plastic-headed hammer) on 
the steering tube.

LT310010

2

1

3

4

5

1

1

6

2

LT310020

2

1

31.6

Removing and installing lower taper 
roller bearing

Removing taper roller bearing

•

Press down steering tube (1) by approx. 5 mm 
and press back again.

•

Press off taper roller bearing (2) and dust ring (3) 
using two large screwdrivers.

Installing taper roller bearing

•

Heat taper roller bearing to 80 °C and slide onto 
the steering tube together with the dust ring as 
far as it will go.

L

 Note:

Dust ring must have no clearance!

•

Grease bearing with, for example, 
Shell “Retinax A”.

Removing and installing upper taper 
roller bearing

Removing taper roller bearing

•

Using a drift, knock out taper roller bearing to-
gether with dust ring (2,3) out of setting ring (1).

Installing taper roller bearing

•

Heat taper roller bearing to 80 °C and press to-
gether with dust ring into setting ring.

L

 Note:

Dust ring must have no clearance!

•

Grease bearing with, for example, 
Shell “Retinax A”.

LT310030

3

1

2

LT310040

1

1

3

2

31.7

Removing and installing bearing outer 
race in steering head

Removing bearing outer race

•

Remove bearing outer race (1) using extractor 
BMW No. 00 5 560 (2), and support ring 
BMW No. 31 4 800 (3).

e

 Caution:

Bearing and bearing outer race belong together, 
always fit together!

Installing bearing outer race

•

With the aid of the spindle of the frame test 
gauge,  BMW No. 46 5 604/605, in conjunction 
with the thrust piece, BMW No. 31 4 820, install 
bearing outer race (4) together with hexagon nut 
and washer to the limit stop.

31 4 800

LT310050

00 8 560

1

46 5 604

LT310060

46 5 605

4

31 4 820

31.8

Measuring telescopic fork

L

 Note:

After a collision, the telescopic fork must be exam-
ined for cracks and damage.

Checking lower fork bridge

•

Clamp fork bridge at steering tube in vice with 
jaw guards.

•

Install two new fixed tubes with test length “A” in 
lower fork bridge (1).

Test installation length ”A” .......... 210 mm (8.268 in)

•

Place two test straight edges, 
BMW No. 31 4 620, over the upper and lower 
ends of the fixed tubes.

•

Determine any distortion by visual alignment (ar-
rows).

e

 Caution:

Replace distorted fork bridges.

31 4 620

LT310070

31 4 620

LT310080

A

1

A