11.4.The fuel pressure at the injectors is held con- stant by the fuel pressure regulator. The amount of fuel delivered to the cylinders is controlled by the length of time that the individual fuel injectors are triggered. The length of time the injectors are triggered varies from 1.5 to 8.0 milliseconds.

11.5.Both injectors are triggered simultaneously. Each triggering causes the injector to spray half the amount of fuel required by the corresponding cylinder on the next cycle.

11.6.The injectors are “hot” as long as the key switch is on. The injection is triggered by the comple- tion of a ground path within the ECU.

11.7.The injectors make an audible “click” each time they are triggered. If this click cannot be heard or felt, there may be a problem with the injector itself, or there may be a problem in the wiring harness.

Figure 11.7

11.8.If a fuel injector is suspect, the circuit may be tested with a commonly available “noid” light, or the injector may be triggered using an electronic fuel injection pulse timer (eg. Thexton model number 139) in conjunction with a fuel pressure gauge. With the key switch off, triggering the injector should result in a measured drop in fuel pressure.

M48 Tank

11.9.The ignition coils are also controlled by the ECU. Each cylinder has its own coil. See Figure 11.9.

Figure 11.9

11.10.The plastic-cased ECU is mounted to the frame, above the fuel pump. See Figure 11.10.

Figure 11.10

11.11.The ECU is the brain of the engine control sys- tem. It is very durable, but there are some rules to follow in order to avoid damage to the ECU:

•If you diagnose a faulty ECU, do not replace it without calling Cub cadet Technical Support for specific handling instructions.

•Previously mentioned: do not use a conventional test light to look for power in the engine control circuit.

•Previously mentioned: do not disconnect any electrical devices while the engine is running.

•Do not reverse the battery terminal connections.

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Cub Cadet service manual M48 Tank
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M48 specifications

Cub Cadet has long been a name synonymous with quality and reliability in outdoor power equipment. Among its impressive lineup are the M48, M72, M54, 48, and 60 models, each designed to provide efficient and effective lawn maintenance solutions for both residential and commercial users. These zero-turn mowers embody advanced technology and engineering excellence that cater to the diverse needs of landscapers and homeowners alike.

The M48 model is compact yet powerful, featuring a 48-inch cutting deck that allows for agile maneuvering in tight spaces. It is powered by a robust engine designed for durability and longevity, ensuring that users can tackle their mowing tasks with ease. The M72, on the other hand, elevates performance with a 72-inch cutting deck, making it ideal for larger properties and commercial applications. Both models are equipped with a hydrostatic transmission, delivering smooth acceleration and precise control while reducing the fatigue often associated with extended mowing sessions.

Cub Cadet's 48 and 60 models focus on providing versatility and performance. The 48-inch deck allows for a perfect balance between speed and accuracy, making it suitable for various terrains. Meanwhile, the M60 model enhances productivity with its 60-inch cutting deck, optimized for efficiency without compromising on quality. These mowers are engineered with cutting-edge technology, including Cub Cadet's signature SmartJet technology, which ensures superior grass cutting and a cleaner, healthier lawn.

All models in this series are equipped with a comfortable operator platform, ensuring ease of operation over long periods. Ergonomically designed seats provide excellent support and minimize user fatigue, contributing to a more enjoyable mowing experience. In addition, the user-friendly control panel and intuitive steering levers allow for quick adjustments and enhanced maneuverability.

Durability is a hallmark of Cub Cadet mowers. Constructed with heavy-duty materials, these machines are engineered to withstand the rigors of regular use while providing outstanding performance. Moreover, select models come with advanced features such as LED headlights for improved visibility during early morning or late evening mowing sessions.

Additionally, the models benefit from a robust warranty program, reflecting Cub Cadet's commitment to customer satisfaction and product reliability. Whether you're a weekend warrior caring for your lawn or a professional landscaper managing extensive properties, Cub Cadet's M48, M72, M54, 48, and 60 mowers deliver the power, performance, and comfort that users expect from a leading brand in outdoor equipment. With these innovative machines, maintaining a pristine lawn has never been easier or more efficient.
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