Linda,
I think it explains in the owners book how to check them, they probably dont need replacing, just adjusting. Its up to you if you wish to try & do the job yourself. Its a 15 minute job for a person handy with cars, most 18 year olds that play with cars know how to do it. You need to be careful not to over tighten them as it can cause failures.

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving