Skid Steer Bobcat 763 Pump Bolt Field Report
The Dealer Didn't Want My Bobcat for the Pump. He Wanted It for One Rear Allen Bolt I Could Touch With My Own Hand.
June 2026 · 8 min read
Fourteen years on this 763. It is the whole business. When it sits, I do not get paid, and the payment is due either way.
There is one bolt on an older Bobcat that has made grown men who run their own iron think about quitting. It is the rear cap screw on the hydraulic gear pump, a 5/16 Allen, bolted to the hydro, where the cab has to come up just to lay eyes on it.
I am not a mechanic by trade and I am not selling anything. I am a sixty-one-year-old who runs a one-man dirt outfit, and I am writing this for every owner-operator who has ever had the cab tilted, a dead machine in the yard, and a season slipping away over a bolt he could touch with one finger.
Because a retired equipment man at the dealer parts counter put the answer in my hand, and told me to pass it on.
Why that one bolt is buried, in plain English
A gear pump is a simple thing. Order the part, tilt the cab, swap it, bleed it, go back to work. The lines come off, the front bolts come out. Then you get to the back of the pump.
Whoever drew that machine set the pump in sideways and dropped a panel right where your hand wants to go. The rear 5/16 Allen cap screw sits in a pocket with no room above it for a handle to travel. You can see the bolt. You can lay a finger on it. It is not rusted and it is not seized, it will turn. There is just nowhere to swing anything square on it. Half the men on the 763 forums end up grinding down an Allen key just to steal a few more degrees.
Every trick in the box. Here is how each one did.
- A long Allen key. Two clicks of swing before it hit the panel, on a cap screw torqued tight.
- A ball-end Allen on an extension. Came in at an angle, then cammed out under any real pull and started rounding the corners of the head.
- A stubby Allen bit in a box wrench. A few degrees, then my knuckles into the hydro.
- A wobble and a universal joint. All angle and no bite, deflecting sideways and walking the bit out of the head.
- A cut-down Allen key off the grinder. Bought a little room, still not enough. Two evenings, that bolt never moved.
What that one bolt really costs a man
Put the real numbers on the table. The dealer was weeks out in the middle of my season, plus the labor, plus hauling the machine to them. I had read the horror stories. A fellow two counties over had drive motors and a hydrostatic pump let go on his T650 and was into it close to twenty thousand dollars by the time the dust settled, two Bobcats sitting dead while the parts sat on back order.
And the part nobody bills you for is your own time. At what a skid steer and operator brings, a slow week down is three or four thousand dollars I do not get back, on top of the note and the insurance that do not care that the machine is sitting. My wife Diane came out, looked at the dead Bobcat, looked at me, and went back inside without a word. After thirty-three years she does not need to say it. A down Bobcat means no billing, and she does the books.
You can get a finger on it. You cannot swing a thing on it. That little pocket behind the pump is the whole story.
Then a parts-counter man put a bar in my hand
A few days later I drove to the dealer to get a price on letting them finish it, the thing I swore I would not do. There is a fellow named Marv who works the counter now. Seventy-three. He ran the service side at a rental yard for thirty years before his knees retired him to the parts desk. I told him about the rear pump bolt, the cut-down Allen, the rounding ball-end, and he did not laugh. He nodded the way an old hand nods at a problem he made his peace with a long time ago.
He reached under the counter and brought out a flat steel bar, not long, with a square drive on one end and a 5/16 Allen bit set in the other, and a slight offset built into the middle. He had me press a thumb on the drive end. Something moved inside the steel. A roller chain, sealed the length of the bar.
"The chain carries the turn around the bend."
A slim, dead straight bar that lays flat into the gap behind the pump where nothing straight will go. You drop the 5/16 Allen bit into the cap screw, and your ratchet comes out the far end in open air where your hand fits. The sealed roller chain inside keeps the bit dead square in the head the whole pull. It is called the Savary offset wrench.
The sealed chain is the trick
A roller chain inside the steel body carries torque round the offset, so it never folds like a wobble or cams out like a ball-end Allen.
Lays flat into the gap
A slim bar slips into the pocket behind the pump where no ratchet can swing, and the handle stays out in the clear.
Takes your own bits
Square drive on the end takes the 5/16 Allen bit and the sockets already in your box. Holds real torque, up to seventy newton meters, a hair past fifty foot pounds.
It reaches. It is honest.
This solves access to a cap screw you can see and cannot get a tool square on. It does not fix a bad pump, and it is not for a bolt rusted or rounded off.
It only comes from one place
You will not find it at the dealer counter and you will not find it at the parts store. The maker sells direct from their own site only. Eighty nine dollars, shipped to your door. That is nothing next to a bay full of labor and a season of jobs going to the other guys with running iron.
What happened next
Other owner-operators who stopped paying for access
"That rear pump bolt has beaten me twice and sent the machine to the dealer once. Came loose square on the first pull with this bar. Did the whole pump in my own yard."
"I have a coffee can full of cut-down Allen keys for tight spots like this. This bar replaced every one of them. The bit stays square instead of camming out."
"Bought a cheap chain bar off the internet first. Folded on the first real pull, just like the article warned. The real one does not give at all. Night and day."
Marv has set more buried bolts than he can count. He told me to order one and pass it on.
Get yours before your next breakdown
If you run a skid steer for a living, and you have ever had the cab up and a dead machine over one bolt you could see and could not turn, you already know exactly what this is worth. It is not for rusted, it is not for rounded, and it is not a magic wand for a bad pump. It is for the bolt that will turn, when nothing you own can swing on it.
Dirt Work Field Notes is a reader-supported publication. This is a first-person account from a skid steer owner and reflects his personal experience. The Savary offset extension wrench is a hand tool designed to reach fasteners in tight, blind locations. It improves access to a fastener; it is not represented as a remedy for hydraulic pump failure, or for fasteners that are rusted, seized, or rounded beyond normal service. Always follow proper service procedures and torque specifications. Results vary by machine and condition. This publication is not affiliated with Bobcat Company or Doosan.
