IMPORTANT: When removing the battery, disconnect the NEGATIVE (Black) wire from its terminal first, followed by the POSITIVE (Red) wire. Re-install in reverse order.

Upper Drive Belt

1.Locate the transmission idler pulley on the upper drive belt by looking through the battery tray opening. See Figure 15.

2.Grasp the bracket and pivot the transmission idler pulley toward the rear of the tractor to release tension on the upper drive belt.

3.Remove the belt from around the transmission idler pulley.

4.Remove the upper drive belt from around the transmission pulley and the variable-speed pulley. Slowly rotate the pulley counterclockwise to roll the belt off it.

5.Remove the upper drive belt by pulling it up through the battery tray opening.

6.Reroute the new upper drive belt as shown in Figure 15.

Lower Drive Belt

IMPORTANT: Note the routing of the lower drive belt around both the pulleys and the belt keepers before performing the following steps.

1.Locate the variable-speed pulley through the battery tray opening. See Figure 15.

2.Remove the variable-speed pulley by loosening the hex bolt that secures it to the transmission. Use a second wrench to hold the hex nut on the bottom side of the pulley.

3.Slide the belt off the variable-speed pulley as you lift the pulley up and out through the battery tray opening.

4.Remove the rear idler pulley from the double-idler bracket while unrouting the belt from around both the rear and the front idler pulley. See Figure 15.

5.Remove the hex bolt from the center of the engine pulley and gently lower it off the engine crankshaft. Be careful not to lose any washers or spacers which may be on top of the engine pulley.

IMPORTANT

1.Proper removal of the lower drive belt requires the removal of several tractor components. Read through the following procedure prior to attempting it to determine if you could successfully complete it. Otherwise, see an authorized service dealer .

2.While installing replacement belts, it is essential to follow the same routing map as the original.

IMPORTANT: When remounting the engine pulley, torque the center hex bolt to between 38 and 50 foot-pounds.

6.Remove the drive belt by feeding it from both ends toward the front idler pulley on the double-idler bracket. See Figure 15.

7.Reassemble by following the above steps in reverse order. Reroute the new belt around the pulleys, belt keepers and keeper pins exactly as the old one was routed. Refer to Figure 15.

•The drive pedal is properly adjusted when the hole in the double-idler bracket has approximately 1-3/8" of travel with ten pounds of pressure applied to the drive pedal. See Figure 16.

Double-Idler

Bracket

Hole

Idler

Adjuster Rod

Front of Tractor

NOTE: View shown from above tractor.

Figure 16

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MTD 604H manual Upper Drive Belt, Lower Drive Belt
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604H specifications

The MTD 604H is an advanced lawn mower designed for tackling various landscaping tasks with efficiency and precision. This powerful machine stands out in the market due to its robust set of features and cutting-edge technologies that cater to both professional landscapers and homeowners.

One of the main features of the MTD 604H is its high-performance engine. The mower is equipped with a dependable gas engine that offers superior torque and power, making it suitable for mowing large areas quickly. The engine's design emphasizes fuel efficiency, which allows users to cover more ground while minimizing fuel consumption.

Another significant characteristic of the MTD 604H is its innovative cutting deck. The mower features a wide cutting deck that can range from 36 to 42 inches, allowing for a larger clipping area. This design reduces mowing time and ensures a clean, even cut regardless of the terrain. Furthermore, the cutting height can be easily adjusted, enabling users to choose the perfect length for their grass type and seasonal conditions.

The MTD 604H also incorporates several user-friendly technologies. For instance, it has a self-propelled system that makes maneuvering easier on various terrains, such as slopes and uneven surfaces. This feature significantly reduces operator fatigue, allowing users to work longer without discomfort.

Additionally, the mower has a plush, ergonomic seat designed to provide comfort during extended use. It comes with easy-to-reach control panels that allow users to operate the mower’s functions without difficulty. The inclusion of a mulch kit further enhances its versatility, allowing users to recycle grass clippings back into the lawn instead of bagging them.

Safety is a crucial aspect of the MTD 604H. The mower is equipped with automatic blade brakes that stop the blades almost instantly when the user releases the control lever. This feature significantly reduces the risk of accidents and enhances user safety while operating the machine.

In conclusion, the MTD 604H is a feature-packed lawn mower characterized by its powerful engine, wide cutting deck, user-friendly technologies, and safety features. Whether for home use or professional landscaping services, the MTD 604H emerges as a reliable, efficient, and versatile choice for maintaining a pristine lawn.
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