Seems to me that you also need to provide more infomation before anyone can respond to your inquiry, like: the number of operating hours/year per machine, number of days per week worked and number of shifts, operating enviroment charactiersitics such as: floor condition, air quality, ambient temperature range of the lift operating environment (can be greater than the temps that the weather person reports), service intervals (PM) you currently perform, lift truck capacities and loads handled, masts type, front end attachments - functions truck perform, do you specify an special 'foundry' dust protection options - air cleaners, cylinder boots, auxilary trans/hyraulic coolers, larger capacity radiators or open core radiators (aka cotton core) less fins /inch w/ more tubes to facilitate radiator blow out and any other "unique" operations.
I've seen foundry that the environments looks like a west Texas dust storm in August and others that you can have lunch on the floor with your best girl friend - describe yours.
And what type of financing do you wish to use FMV lease or conditional sales contract (aka $1 buy out)
I'm certain others can add to my list of clarifications but this will get you headed in the right direction to get a better "guesstimate" from afar.
Armed with this information it would be advisable to seek an opinion from a reputable full service lift truck dealer in your area - that has all the tools to keep you up an running - parts availablility, training & materials for your "in house" techs. An on site survey of your operations by lift truck personnel is a must and you rvisit to their facilities will help you make a much better informed decision - like "show & tell" - they are the experts.