The basic lift capacity is 4000 lb. at 24" LC. The net lift capacity may be different depending on how the unit is equipped - i.e. two stage mast or 3 stage mast, mast max. fork height, attachments (side shift, fork positioner, etc), amount of mast tilt (fwd/back). This info needs to be made known first before a capacity rating can be given.
It should be a 1987 H40XL (H2.00XL) with a Isuzu C240 (5.2L) motor, it was built in Tacoma,Washington by Star Iron & Steel Co. It weighs 7750lbs or 3515kg and has a lift capacity of 4000lbs at 24" load center.