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5115 Hadley Ave. N., St. Paul, MN 55128 (USA)  www.parktool.com

PARK TOOL CO.

CM-25

 Instructions / Instructions / Anleitung / Instrucciones

CM-25 Professional Chain Scrubber

Before You Begin 

Slide handle (#7) up firmly into slot in CM-25 

Professional Chain Cleaner body (#1). With enclosed 1.5mm hex wrench, 

tighten set screw (#3) in handle just enough to secure the handle to the 

body of the CM-25. Place newspaper or other floor protection under 

work area. Remove excess mud, dirt and sand from chain and other 

components with Park Tool GSC-1 GearClean™ Brush or rag. Shift to 

smallest rear cog. Shift to a chainring or tilt bike in stand to make lower 

section of chain horizontal.

To Use

1.  With the handle of CM-25 facing towards you, flip silver locking lever to 

down position.

2.  Open lid and fill with CB-4 Chain Cleaning Fluid to lower ridge, inside 

bottom half of CM-25 (approximately 2 oz.).

3.  Attach the CM-25 around lower section of chain as shown, making sure 

chain seats in between brushes, close lid and then lock in place with 

silver lever in up position.

4.  Crank pedals backwards 30 revolutions

5.  Empty CM-25 and rinse with water. Squeeze fluid from sponge.

6.  Repeat steps 1–4.

7.  Dry and then lubricate chain.

Tips

•  Water and a small amount of dishwashing detergent may be substituted 

for cleaning fluid in step 6.

•  Replacement brushes and sponges are available. Ask your favorite 

retailer for Park Tool part # RBS-25.

Caution

•  Park Tool CB-4 Bio ChainBrite Chain Cleaning Fluid is recommended.

•  Do not use gasoline, petrol, kerosene or other highly volatile or flammable 

solvents.

•  Do not store cleaning fluid in CM-25.

•  Dispose of spent cleaning fluid responsibly.

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2

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CM-25 PART NUMBERS

Ref. # Part #

Description

Qty.

1

2340

Base

1

2

2344

Retaining Clip

1

3

2345

Button Head Socket Cap Screw

1

4

2346

Top

1

5

2347

Pivot Bushing

2

6

2348

Pivot Screw

2

7

2351

Handle

1

8

1158-3

Washer

2

9

2343

Set Screw

1

10

RBS-25 Brush Assembly

1

11

2342

1.5mm Hex Wrench

1

© 2016 Park Tool Co.

PARK TOOL® and the color BLUE are registered trademarks of Park Tool Co.

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