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Printed in USA  4555  11/13

Big Boat End Controls 

Replacement Parts: 3173, 3174

1

2

3

4

5

6

4

7

7

5

8

9

10

11

1

2

3

4

5

7

7

8

9

10

11

For additional safety, maintenance and warranty information see www.harken.com/

manuals or the Harken

®

 catalog.

Warranty

Inspect

Carefully inspect track and mounting hardware for any signs of loosening, cracks or 

damage. Inspect end stops to make sure they are secure and that there are no cracks or 

damage. Arrange control tackle so cars do not hit end stops under load.

WARNING! Failure to inspect tracks and stops can result in track 

pulling off deck suddenly and unexpectedly during high load.

Maintenance

Traveler Cars:

 Clean by frequently flushing with fresh water. Periodically clean car by 

squirting a detergent/water solution into center openings. Roll car back and forth to  

distribute evenly then flush bearings with fresh water.
Do not use spray lubricants because ball bearings may skid not roll. Apply  

a few drops of McLube

®

 OneDrop

 to ball contact surfaces of track.  

Roll car back and forth through OneDrop

 several times to distribute 

onto bearings. Wipe remaining OneDrop

 off track. OneDrop

 is  

preferred but you can also use one to two drops of a light machine oil. Too 

much oil attracts dirt.

Track:

 Clean with detergent and water. 

Important! Exposure to some teak cleaners and other caustic solutions can result  

in discoloration of part and is not covered under the Harken warranty. 

Control Block Replacement Parts

No. Part No.

Description

No. Part No.

Description

1

Cheek assembly screws (3)

7

HBB172 Control Block Screws (Set)(2)

HFS797 3174 HL Double (3)

HFS1073 M10 X 1.5 x 25 mm (2)

HFS796 3173 HL Single (3)

HFS1074 M10 X 1.5 x 45 mm (2)

2

H-21641A Isolators (3)

8

2132 Shackle (1)

3

H-22471C Sideplate (Top) (1)

9

HFS786 Helicoils (M4 x .7 x 6 mm)(3)

4

HBB85 Rollers Bearings w/Cage (22)

10

4306 Harken Label (2)

5

H-21635B Sheave (1)

11

H-38067A Bumpers (2)

6

H-22473C Sideplate (Bottom) (1)

Printed in USA  4555  11/13

Big Boat End Controls 

Replacement Parts: 3173, 3174

1

2

3

4

5

6

4

7

7

5

8

9

10

11

1

2

3

4

5

7

7

8

9

10

11

For additional safety, maintenance and warranty information see www.harken.com/

manuals or the Harken

®

 catalog.

Warranty

Inspect

Carefully inspect track and mounting hardware for any signs of loosening, cracks or 

damage. Inspect end stops to make sure they are secure and that there are no cracks or 

damage. Arrange control tackle so cars do not hit end stops under load.

WARNING! Failure to inspect tracks and stops can result in track 

pulling off deck suddenly and unexpectedly during high load.

Maintenance

Traveler Cars:

 Clean by frequently flushing with fresh water. Periodically clean car by 

squirting a detergent/water solution into center openings. Roll car back and forth to  

distribute evenly then flush bearings with fresh water.
Do not use spray lubricants because ball bearings may skid not roll. Apply  

a few drops of McLube

®

 OneDrop

 to ball contact surfaces of track.  

Roll car back and forth through OneDrop

 several times to distribute 

onto bearings. Wipe remaining OneDrop

 off track. OneDrop

 is  

preferred but you can also use one to two drops of a light machine oil. Too 

much oil attracts dirt.

Track:

 Clean with detergent and water. 

Important! Exposure to some teak cleaners and other caustic solutions can result  

in discoloration of part and is not covered under the Harken warranty. 

Control Block Replacement Parts

No. Part No.

Description

No. Part No.

Description

1

Cheek assembly screws (3)

7

HBB172 Control Block Screws (Set)(2)

HFS797 3174 HL Double (3)

HFS1073 M10 X 1.5 x 25 mm (2)

HFS796 3173 HL Single (3)

HFS1074 M10 X 1.5 x 45 mm (2)

2

H-21641A Isolators (3)

8

2132 Shackle (1)

3

H-22471C Sideplate (Top) (1)

9

HFS786 Helicoils (M4 x .7 x 6 mm)(3)

4

HBB85 Rollers Bearings w/Cage (22)

10

4306 Harken Label (2)

5

H-21635B Sheave (1)

11

H-38067A Bumpers (2)

6

H-22473C Sideplate (Bottom) (1)

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