can we claim Input tax credit on gst paid for repairs and maintenance of forklifts

ITC will not be available for goods or services exclusively used for: 
a. Personal use
 b. Exempt supplies
c. Supplies for which ITC is specifically not available

in other case u can claim ITC if repair and maintenance is for the capital goods there are used in furtherance of business 

yes, itc is available on repair and maintenance of forklift. you must have taken it under plant and machinery in your bs.