Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

Have a circa 1970 7 HP Ariens chassis with a newer 7 HP Teucmseh engine.   Has the great differential.   Had a new problem in the last storm.

Twice, both times just after changing gears, the wheels both locked into position.  Auger/impeller continued to turn.  Engaged the shifter in verious gears and wheels remained locked.  Couldn't turn the machine, couldn't budge it.  Like it was stuck where it was.  Suddenly it freed itself as if nothing had gone wrong.

This was the first time it was used after I changed the belt.  I also had removed and reinstalled the impeller assembly after it seized.   I have no idea why the impeller  was stuck, but assume a rock or something was behind it.  The assembly spun fine after being reassembled, and it spun fine when the wheels were locked. 

I haven't a clue why the wheels would lock.  As I type this, I wonder if the differential engaging knob on the wheel is in the proper postion.

Any assistance appreciated.

New ones are on sale now at Home Depot.  It's tempting to get one, but I'd really like to keep this one going.

perhaps u have to readjust belts after 15 minute run/stretch.

The auger was turning fine, so I can assume the belt was fine.

And on this model, I think it's called a 724, there isn't an adjustment for the belt tension

Something mechanical solidly bound the wheels from turning.

If it's a single belt machine and the auger is engaged and turing, I'd take a look at the friction wheel assembly. It's on a spring loaded carrier and may be hanging up or need adjustment.

This one doesn't have a differential but this is what the old ones look like inside.

Garandman wrote:

GARANDMAN,

Your pictures are great . If I should ever have any OPE issues You and the rest of the bunch will definitely help me out !!!!

The rubber wheel on mine looks much better than the rubber wheel on yours. 

It appeared that if that part were malfunctioning that the engine power would not be transmitted to the wheels, and that the wheels would still rotate if the blower was pushed around by hand.

In my case, the wheels were stuck - couldn't push the snowblower - couldn't  turn the snowblower - it's like a parking brake had been applied. 

Garandman wrote:
The bearing to the left side of the friction wheel looks like it's on an angle or worn out.

DNK1 wrote:
...Or partially dissasembled for rebuilding, which is why there waa no chain. Shifter not shown.

Here's the same machine after completion of the refurbishing. It's a 1970.

So the engine drives the disk that turns the rubber wheel that connects to the chain that drives the gears that turn the wheels......

How can I diagnose an infrequent seizure of the wheels turning?

Wheels lock hard in place, won't turn, the snowblower won't turn and the problem starts when shifting gears and it returns to normal sometime after under no specific condition as if nothing had happened.

First thing I'd do is the simplest. Disconnect the spark plug, and prop up the wheels on some crates or tip the unit forward securely, and take the bottom cover off the drive unit.  Shine alight in there and take a look.. Check the shifter action as well.

You never know. I bought a parts machine that was in great shape with a blown engine. But the drive unit didn't work properly. After I removed the mouse nest, and the shed snake skin, it worked much better.....