Schwinn 420 Service Manual download pdf (Page 10)

Basic Troubleshooting

Problem: Crank Arms or Pedals Feel Loose

Solution:

A. Make sure the pedals are tightly screwed into the crank arms.

(See Figure 6.)

B. Make sure the crank bolts on both crank arms are tight.

C. Make sure the square opening in the crank arms have not been

rounded out. This problem is caused when the bike has been

ridden with loose arms. Replace the crank arm if the sqare taper

shows damage.

D. Make sure the bottom bracket is tight in the frame and bearings

operate smoothly.

Figure 6

Problem: Handlebar or Seat Post is too Tight

Solution:

A. Clean and lubricate the handlebar/seat post extension tube

and frame sleeves with silicone lube.

B. If ﬁt remains tight, switch the handlebar or seat post with

one from another bike.

C. If this does not ﬁx the problem order a new sleeve.

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Schwinn 420 Service Manual Page 10