User Guide

34
Introduction
The Shimano Nexus 7 speed shift system consists of those parts of
the bicycle which allow you to shift gears including the shifter, rear hub,
and shift cable. The shifting mechanism is enclosed, keeping the shifting
system lubricated for low maintenance.
Shifting Pointers
When shifting gears, plan ahead. Shifting gears is best performed
when coasting, stopped, or back pedaling. If you must shift while
pedaling, reduce your pressure on the pedals. Excessive chain tension
makes shifting difficult. Choose the gear most comfortable for riding
conditions. You should be able to maintain a constant rate of pedaling.
Listen to your bike. A properly adjusted shift system is quiet. If
an unusual noise follows any shift, your shift cable may need to be
adjusted. If after adjustment the noise persists or grows louder, stop the
bicycle and try to locate the noise. If necessary, ask your Fisher dealer
to identify and correct any problems. For more information about your
shift system consult your Fisher dealer.
Inspection
Before every ride, make sure the Nexus hub gears are properly
adjusted. With the shifter in 4th gear, the red lines on the hub’s pulley
and the cog joint bracket (Fig. 44) should line up.
Once a month, check the shift cable for kinks, rust, broken strands,
or frayed ends. Also check the housing for bent ends, cuts, broken
coils and wear. If you suspect a problem with your shift cable, do not
ride your bicycle. Replace the cable and/or housing before riding your
bicycle by following these instructions, or take your bike to your Fisher
dealer for service.
Adjustment
If the red lines on the hub’s pulley and the cog joint bracket do not line
up when the shifter is in 4th gear, adjust the gear cable tension. Rotate
the shifter barrel adjuster (Fig. 45) until this alignment is achieved.
Shift to 1st gear, then back to 4th, and recheck the adjustment.
Lubrication
Lubricate shift cables with Wrench Force
®
synthetic chain lube or
a similar lubricant whenever they are being replaced. Lubricate the
Nexus hub bearings once a year. This procedure takes special tools and
training, so should be done by your Fisher dealer.
To replace the shift cable, loosen the cable fixing bolt and remove the
cover on the front of the shifter secured by a phillips head screw. Slide
the cable end cover (Fig. 46) forward. Note the path of the old cable as
you remove it. Install a new cable in the shifter following the old path,
and reattach the cable fixing bolt. Follow the instructions in Adjustment
to finish installation.
SHIMANO NEXUS 7 SPEED INTERNAL SHIFT SYSTEM
Fig. 44
Pulley Cog joint
bracket
Shift cable clamp bolt
Fig. 45
Shift cable barrel
adjuster
Fig. 46
Cable end cover