Model #31P977-0575-E1 Briggs & Stratton engine

  • Cylinder/sump-engine/crankshaft
    3 Results
  • Carburetor/blower Housing
    3 Results

Question and Answers

Q:

diagram for carburator,engine 31p977

A:

If the engine was running rough and hard to start even before cleaning the carburetor then it may have simi-sheared flywheel key, carburetor issue or a voltage supply issue to the fuel shut off solenoid. You will have to remove the flywheel in order to inspect and replace the flywheel key. This could require a flywheel puller in order to remove the flywheel.

The small round brass part with a small hole and rubber 0-ring could have been part of the fuel shut off solenoid. The fuel shut solenoid could be faulty. Based on your symptoms I recommend calling a service technician with the training and knowledge to come out and repair your mower or you can take it in for repair.

If you do not feel confident repairing this problem yourself, then you can have it repaired by a Sears technician. Here is a link that will provide the nearest drop-off locations: Sears Home Services .

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Joey S -
Sears Technician
June 28, 2010
Q:

Craftsman DLS 3500 model 31p977 Lawn Tractor

A:

The most likely reason for a lawn tractor to not drive is a broken ground drive belt or a belt that is off the pulleys. To check the belt lower the deck to the lowest position and don’t start the engine. Visually inspect the belt that goes from the engine pulley, through some idler pulleys, and around the input pulley on the transaxle. Get someone to push the clutch pedal in and see if the belt gets loose and then gets tight when the clutch pedal is let out. Sometimes the idler pulley bracket will stick or bind and not move to tighten the belt. This can usually be corrected by spraying the idler pulley bracket with WD40 or a similar product. After spraying move the idler bracket back and forth by hand to free it up.

The manual will have the belt routing in the maintenance section for both belts.

Set the parking brake and chock the rear tires to keep them from turning and start the engine. Be sure the ground drive belt is turning the input pulley on the transaxle. If the input pulley is turning the belt is doing its job. If the input pulley is turning on a lawn tractor with a 5 or 6 speed transaxle and the tractor is not moving, something is broken or worn inside the transaxle or the keys are not installed in the rear wheels. If the keys are left out the axle will turn but the wheels won’t.

If the input pulley is turning on a hydrostatic transaxle but the transaxle is not driving the lawn tractor, the keys in the rear wheels could still be the problem. The brake pads can also stick and cause this problem on a hydrostatic transaxle.

The brake pads stop the tractor by stopping a brake disc on the side of the transaxle. You can test the brake shoes by inserting a .010 feeler gauge between the brake shoes and the brake disc. If the brake is working properly there will be .010 clearance between the brake disc and the brake shoes when the brake pedal is released. You can usually solve this problem by spraying the brake mechanism liberally with WD40 or a similar product and moving the brake lever on the side of the transaxle back and forth by hand. Sometimes some parts of the brake mechanism might need to be replaced.

There is a possibility that the hydrostatic transaxle could be low enough on oil that it is not driving the lawn tractor. If this is the case there will be evidence of oil leaking around the seam where the top and bottom housings of the transaxle join or where the axle seals or a shaft comes out of the housing. You will probably need a technician to repair this kind of problem. You can call 1-800-469-4663 or go to www.searshomeservices.com and schedule service for a Sears technician to diagnose and repair the problem.

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Here is a link to order any parts you need. Sears Parts Direct .

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Mark T -
Sears Technician
September 12, 2010
Q:

I have a problem with the valves staying set on a 20hp model 31p977. Why?

A:

The rocker arm bolt has a locking screw in the center of it. I am sending you an image for adjusting the valves on your engine.

If you are adjusting the locking screw and the valves are still changing, replace the rocker arm bolt with the locking screw.

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Jimmy K -
Sears Technician
April 12, 2010