Installation manual

SERVICE INTERVAL SCHEDULE

To maintain optimal performance and durability of the HammerSchmidt, periodic maintenance is required. If you ride in extreme

conditions, maintenance should be performed more frequently.

IMPORTANT:

We recommend that you have your Truvativ HammerSchmidt serviced by a qualiﬁed bicycle mechanic. Servicing the HammerSchmidt

requires advanced mechanical skill, knowledge of planetary gear systems, as well as access to and knowledge of use of the special

tools required for service.

Component Service Interval

(hours)

Bottom Bracket Re-lubricate BB splines 25

Collar Plate Check collar plate bolt torque 25

Clean dirt and debris from collar plate assembly and re-lubricate 25

Mechanism and Crank

Arms

Check planet nut torque. Damage can result from over-tightening 25

Check crank bolt torque 25

Inspect chainring for wear 25

Inspect mechanism assembly function for wear or contamination 25

Clean dirt and debris from inside of mechanism and re-lubricate 100

HAMMERSCHMIDT SYSTEM TORQUE VALUES

Recommended torque values for the HammerSchmidt are provided below.

IMPORTANT:

Do not exceed the recommended torque values. Over-tightening can result in damage to the unit.

Component Part Torque Value Needed Tool

N·m in-lb

Bottom Bracket Bottom Bracket Cups 34-41 301-363 Truvativ ISIS and GXP tools (or

equivalent)

Collar Plate Cable Anchor Bolt 2.2 20 4 mm hex

Cable Housing Stop Bolts 0.6 5 2 mm hex

Chain Guide Bolts 0.7 6 2.5 mm hex

Collar Plate Bolts 4.5 40 4 mm hex

Disk Bolt 0.6 5 2 mm hex

Mechanism and Crank

Arms

Chainring Nut 4.5 40 6 mm hex

Crank Bolts 48-54 425-478 8 mm hex

Planet Nuts 5.6 50 5 mm hex

Shifter Shifter Clamp Bolt 2.5-4.0 22-35 5 mm hex

GREASE

IMPORTANT:

Use only the HammerSchmidt grease kit for re-lubrication. Poor performance and accelerated wear can be expected from use of

other lubricants.

SERVICE SCHEDULE / TORQUE VALUES