Knuckle Boom Crane

Knuckle Boom Crane

Having been exposed to them on the job site, I’ve realized just how handy these accessories are, and I wanted one.

Truck specs:
Year: 1951
Model: L-162
GVWR: 16,000 lbs
Engine: most likely the Silver Diamond 240 OHV inline-six, 240.3 cu in (3,938 cc) and 108 hp (81 kW) (LB-140/L150/160)
Transmission: 4 speed manual
Rearend: 2 speed vacuum shift
Hydraulic system: Williams hydraulic pump model 30, serial number: 581182

Crane Specs:
Year: 1976-1982
Model: 715
Max reach: 15′ 4″
Max weight at max reach: 4500 lbs
Crane weight: 3450 lbs
Outrigger span: 10’10”
Optimal pump capacity: 9 GPM
Recommended tank size: 11 US Gal



Mine currently only has one hydraulic extension, and so with that extended, it can lift 4500 lbs, at a reach of 15′ 4″.

load chart crane Capacity Table


NOTE: positions 4 & 5 are not applicable on my crane as they don’t exist.  Those numbers do become important if I were to add a manual extension to calculate the capacity.


Detailed build pages



Knuckleboom Crane in use:

Using the knuckleboom to unload the Leblonde lathe

man basket on knuckle boom
Man Basket attachment


Knuckleboom crane vertical Collage