721 Attachments??

[Sundance]

My little old 721 has aux hydraulic lines.............. But what can it realistically run?? A backhoe?? How about a post hole digger??

 

[OldMachinist]

The specs http://www.bobcat.com/historical_specs/skid_steer/721_1975 say you machine's pump capacity is 10 GPM so attachments that just use cylinders like a backhoe,grapple,4 way bucket would work. Attachments that use hydraulic motors like a post hole digger would be borderline but most of these attachments require 14 gpm or greater.

 

[jmatt20]

The specs http://www.bobcat.com/historical_specs/skid_steer/721_1975 say you machine's pump capacity is 10 GPM so attachments that just use cylinders like a backhoe,grapple,4 way bucket would work. Attachments that use hydraulic motors like a post hole digger would be borderline but most of these attachments require 14 gpm or greater.

1978 my first bobcat ..used 721..great little machine ,i had a backhoe attachment and it worked fine ,it had enough power to pull the 721 all over the place if you were digging hard ground . I rented an old hughes breaker that worked ok but a little slow and i also used the old style hole auger( the one with the chain reduction) turned a little slow and didn't like cobble rocks but it beat the hell out of digging by hand ..

 

[Sundance]

1978 my first bobcat ..used 721..great little machine ,i had a backhoe attachment and it worked fine ,it had enough power to pull the 721 all over the place if you were digging hard ground . I rented an old hughes breaker that worked ok but a little slow and i also used the old style hole auger( the one with the chain reduction) turned a little slow and didn't like cobble rocks but it beat the hell out of digging by hand ..

Thanks............. I would love to know what the model number of the backhoe you used was. Also if you know the model of the post hole digger. Thanks again

 

[Tazza]

Thanks............. I would love to know what the model number of the backhoe you used was. Also if you know the model of the post hole digger. Thanks again

The flow you will get on that machine will do just fine on any back hoe attachment that is of a suitable size for the machine. If it can lift it, it will work just fine. The pressure will be there, the flow will be a little lower (only a few GPM lower than a modern non hi-flow machine), but you don't want it to move at light speed.

 

[jmatt20]

The flow you will get on that machine will do just fine on any back hoe attachment that is of a suitable size for the machine. If it can lift it, it will work just fine. The pressure will be there, the flow will be a little lower (only a few GPM lower than a modern non hi-flow machine), but you don't want it to move at light speed.

well i've been asleep once or twice since then . i believe it was a 909 but instead of ball attachments it had some hooks right if front where you get in and the hoe had some levers that latched over the hooks. it had vertical stabilizers and i remember that if you got the front of the machine off the ground and were digging hard dirt the mount would come loose ... the auger was a model 12 i think, had a big square box with the drive motor in it and a chain reduction drive.. round shafts not like the hex ones they have now... btw i think davis actually made the backhoe attachment , the hooks were not outside over the tires like the new ones ..but right were you got in the machine....hope this helps