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Small Engines (Lawn Mowers, etc.)/Intek Pro 65 OHV B&S Ride on mower not pulling cleanly

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Intek pro 65 ohv Ride on
Intek pro 65 ohv Ride  
QUESTION: Dear Mr. Jones,

I have an Intek Pro 65 OHV Briggs & Stratton Ride-on mower. (pic included)


My problem:
The mower does not pull "cleanly" in any gear.  It "jerks";  it accelerates-jerks-accelerates-jerks; as if you are advancing the throttle then ease off the whole time (but the throttle remains in the same position),  but when it idles or rev's, the engine runs smoothly (in Neutral position).


My question:
Could it be due to a worn belt, or possibly, something wrong with the gearbox?


What I have done so far:
*I gave the engine a service (spark plug, air filter + pre filter, new oil).  The engine starts easily, idles smooth and rev's beautifully.

*I have adjusted the belt so it's firmer by adjusting the tensioner.  It is quite taut now and somewhat hot after a few minutes of riding.  

*I removed the rear wheels to see if the keys and key-ways which drive the mower are still intact, they seem fine.



Thank you kindly in advance for any suggestions/help.

ANSWER: Can you describe the drive system?  It is a friction disc drive system like Snapper mowers use or does it have a gearbox and rear axle?

I've seen some similar mower designs but nothing exactly like yours.

Let me know about the drive system.

Eric

---------- FOLLOW-UP ----------

Underside of mower
Underside of mower  
QUESTION: Thank you for the speedy reply Mr. Jones,

I have found that the chassis of this specific type of mower is generic and thus was branded under different names ex:

*Castel Lawnking AT63 Ride on Lawnmower 24in Cut
*Garden Compact E Stiga
*Mountfield 725 M Ride On Lawnmower

On the seller's pages there were 2 descriptions given for the transmission namely ,
1.) Transmission variable forward and reverse,
2.) Gear and differential 3 + R

My mower has a gearbox which ultimately drives the rear axle by way of keyways and keys in the wheels and on the axle.

I  found an image of one of the models which might be helpful

ANSWER: The transaxle in the picture is very similar looking to Tecumseh/Peerless or Dana/Foote/Spicer units.  It's likely one of these companies made your transaxle.

The description says variable...can you tell me if you have 1 drive belt or 2 drive belts for the traction drive?  

Do NOT count the blade belt...the blade belt should not be part of the traction drive system.

Thanks.

Eric

---------- FOLLOW-UP ----------

Single belt driven
Single belt driven  
QUESTION: Dear Mr. Jones,

I can see only one belt linking the engine and the gearbox.

(see image)

Answer
Thanks for the picture.  The fins on the transaxle case are interesting...something I have not seen on Peerless or Foote/Spicer units we have in the US.

Are there any manufacturing numbers or a brand name on the transaxle.  Often times there is a sticker, raised letters, or a metal tag on the transaxle with the manufacturer's name along with the transaxle model number.

You may have a hydrostatic transaxle.  Are there multiple forward gears where you have to manually shift or change gears for different speeds?

Eric

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Eric A. Jones

Expertise

Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.

Experience

Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

Education/Credentials
MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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