I want a diregram of the drive belt around the adjustment pulleys for a lynx rd1040 kingcat ride on mower

Safety and Preparation Serious injury can occur if the engine or mower blades accidentally start while you are working with lawn tractors. To prevent this, drive the Murray lawn tractor onto a flat work surface and disengage the mowing deck cutting blades. Engage the parking brake to keep the mower from moving; chock the wheels with a wooden block or brick. Adjust the mowing deck to the lowest position. Turn off the engine and remove the key from the ignition. While not necessary, you may even wish to disconnect the spark plug wire from the spark plug. Mowing Deck Removal You must remove the mowing deck on a Murray lawn tractor to gain access to the belts. Remove the adjustment rod hairpins, followed by the adjustment rod pins from the front left and right sides of the mowing deck. At the rear on the left and right sides, pull out the retaining hairpins and slide the mowing deck suspension links from the adjuster plates to separate the rear mowing deck from the frame. Remove the blade control rod stud, including the hairpin and washer, from the top of the blade control lever shift linkage at the left rear of the deck. Remove the front hanger rod, including the hairpin and flat washer that hold the rod in place. Loosen the belt guide retaining bolts with a socket wrench and remove the engine stack pulley belt so you can slide the mower deck out from under the tractor Transmission Drive Belt Installation Slide the new transmission drive belt between the engine stack pulley belt guides, over the belt guide plate and under the engine stack pulley. Fit the transmission drive belt around the top engine stack pulley. Push the free end of the transmission drive belt up through the transmission shifter hole in the lawn tractor floorboard. Slip the transmission drive belt loop over the transmission shifter. Pull the transmission drive belt down through the transmission shifter hole. Fit the transmission drive belt around the transmission drive pulley and tighten the transmission drive pulley belt guide retaining bolts to hold it in place. Fit the transmission drive belt flat side around the idler pulley. Slide the idler pulley onto the idler pulley stud while holding the belt in place. Tighten the transmission idler pulley retaining nut with a socket wrench to secure the idler pulley to the idler pulley stud. Mowing Deck Drive Belt Installation Pull back on the right side mowing deck mandrel pulley spring-tensioned belt retainer. Guide the new mowing deck drive belt around the right side mandrel pulley and release the belt retainer. Pull the drive belt spring-tensioned retainer away from the mowing deck idler pulley, guiding the deck drive belt around the idler pulley. Fit the mowing deck drive belt around the left side mandrel pulley and under the rear mowing deck cross link rod between the right and left side mandrel pulley. Slide the mowing deck under the right side lawn tractor frame, reconnecting the deck to the frame in reverse order of removal. Engage and disengage the mower deck while driving the mower to test the belt for proper operation.

There is a spring loaded idler pulley that keeps the drive belt tight. The spring selfs adjust it. But make sure your bypass valves are not release to roll it around. If the belt wears to thin it will hit the bottom of the pulley and will slip . I doubt both drive units went bad at the same time.

Hope this helps. Serpentine Blade Drive Belt
1 Lower the mower deck to its lowest position.
2 Route the serpentine blade drive belt (part number 6109) onto the V-pulleys located on the mower deck. One double pulley is located at the front of the deck near the center. The other two pulleys are located near each side of the deck. Route the belt around the outside -- the side toward the outer edge of the mower deck -- of each pulley. For the double pulley near the front of the deck, route the belt around the lower pulley (part number 6058) only. If pulleys are fitted with belt guards, work the belt in between the pulley and shield.
3 Push the idler pulley toward the center of the deck with your hand. The idler pulley (part number 6059) is the fourth pulley on the deck and is located near the rear of the deck. It is the only movable pulley on the deck. Wrap the belt around the side of the pulley nearest the edge of the deck. Release the idler pulley to place tension on the belt. No adjustment is necessary because the serpentine idler spring (part number 6065), located on the idler pulley, adjusts the belt to the correct tension.

Roy if it is the correct belt and fairly new, check your manual for belt adjustment, if it shows that there is no adjustment the pulleys may be worn out, on a lot of mowers the pulleys are ware items and changed more often to correct slipping issues. The other thing to check is the belt tensioner if equipped, it could be seized, weak or missing spring or it may even be adjustable by cable end being threaded or slotted bolt holes on tensioner arm.
Check the attached links,instruction and guides, Good luck
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There are Belt keepers bolted near the pulley that will have to be loosened up and moved out of the way to allow the new belt to go around the pulley. once in place they must be adjusted back in place the space must be a little smaller then the belt width about 1/8- 1/4 of an inch..This will keep the belt in place..good luck

There are no belt adjusters on most mowers, they gave spring loaded constant adjusters..if the belt is coming off it because the belt is worn..your mower should have one or two adjustable belt protectors around the the motor and deck pulleys they keep the belt from coming off during on and off operations the design is to be set close enough to the pulleys that will not allow the thickness of the belt to pass through...so if the belt is Worn too much or the proctectors are out of adjustment the belt will come off..usually during non mowing or just when engaging the deck or drive..kind of tricky to get at..but can be done yourself...do check them out if they are more then about 1/4-3/8 inch they are out if adjustment..if not the belt is worn out...good luck..

follow this steps and fix it. GOD BLESS YOU
If grass is poorly or unevenly cut, try mowing at a slower speed and adjusting the engine speed with instructions in your owner's manual. Scrape away any dried grass and other debris caked under the mower deck. Sharpen or replace dull or bent blades . Check and replace a worn belt.
If the V-belt slips or comes off during use, clear any debris in the belt area, adjust the drive-belt tension (see below), or have the belt replaced. Adjust and tighten pulley fasteners or have a service center replace worn parts.
If the belt squeals or wears excessively, adjust the drive-belt tension (see below) and look for obstructions around the belt. If that doesn't work, take the mower in for professional service.
If the mower vibrates excessively when the clutch is engaged, scrape away any debris accumulated under the deck. Balance the blade and replace the blade if needed. If that fails, adjust drive-belt tension (see below). If you find that the drive belt, pulley, or other belt-drive part is damaged, consider having it replaced by a professional.
If the mower is hard to shift or doesn't move when the clutch is engaged, adjust the drive-belt tension (see below). Also make sure the mower is lubricated according to the owner's manual specifications. As needed, have the mower serviced for damaged or maladjusted clutch/brake pedal linkage.
If the engine doesn't start, loses power, or dies during use.
Replace a recoil starter rope:

1. Disconnect the spark plug cable for safety.
2. Disengage the throttle cable from the housing and remove the housing as needed to access the starter.
3. Remove the handle from the rope, which is often held in place by a knot or retainer pin.
4. Unfasten the other end of the rope from the starter using pliers or a cutter as needed.
5. Knot the end of the replacement rope.
6. Tighten the pulley counterclockwise all the way, then back it off two turns and hold it firmly.
7. Thread the unknotted rope end through the pulley hole.
8. Thread the rope through the housing hole and pull it taut.
9. Slowly release the pulley, allowing the rope to wind around the pulley.
10. Attach the handle and reassemble as needed.
11. Reconnect the spark plug cable.

Replace a recoil starter spring:

1. Disconnect the spark plug cable for safety.
2. Remove the housing and the spring cover.
3. Carefully remove the rope from the pulley to release spring tension.
4. Remove and replace the spring as recommended by the manufacturer.
5. Reinstall the pulley, rope, and housing following the instructions above.
6. Reconnect the spark plug cable.

Hi, check the idler pulley arm and return spring on that belt. Its most likely not pivoting freely allowing the belt to loosen when you operate the clutch, regards Phil.

This is actually pretty simple:

Remove Pto guard on mower deck

Stand mower up on back stands

Pull the friction disc away from the drive disc

slip new belt in between the friction disc and drive disc pushing all the way through

release friction disc allowing to come back in contact with drive disc

loop belt around engine pulley

let mower back down

route belt around mower pulley

loosen guides on idler pulley

route belt through idler pulley

with engine off move pto lever to tighten mower belt

adjust guides on idler pulley allowing 1/8" from belt

tighten bolt on idler pulley

release pto tension

install mower pto guard

and you should be ready to mow

Maintaining Riding Mowers Regular maintenance can reduce repairs.

Components of a typical riding lawn mower. (click to enlarge)

It's fun to ride around the yard on the mower, watching scrubby grass (and weeds) turn into trimmed lawn. However, when the grass looks as bad after you mow as it did before, or the mower doesn't want to start, riding mowers aren't as much fun. That's when it's time to put on your Fix-It Club hat and have some more fun.

A riding lawn mower is a gas-powered machine for cutting grass. The engine turns a rotating blade that cuts the top off the grass blades to a specified height. The operator sits atop the mower on a tractor-type seat with speed and height controls nearby. Riding mowers also can be used to pull small utility carts for other yard jobs.

To remove the mower deck:

1. Make sure that the parking brake is locked.
2. Place scrap lumber under the front and rear of the deck.
3. Use the deck lever to lower the deck.
4. Remove attachments from the deck.
5. Remove the blade drive belt from the front pulley.
6. Remove the front and rear deck fasteners, following instructions in your owner's manual.
7. Use the deck lever to raise the deck.
8. Remove the scrap lumber.
9. Remove the deck from under the mower.

To adjust the drive belt:

1. Remove the belt from the large idler pulley.
2. Remove the belt from the adjustable idler pulley.
3. Carefully remove the spring-loaded large idler pulley.
4. Loosen the adjustable idler pulley and move it slightly toward the rear of the mower to tighten it[md]or move it toward the front to loosen it—and retighten the pulley.
5. Replace the belt.
6. Check belt tension and readjust as needed.