Morra MH 530 - User Manual

The Morra MH 530/420 tedder is an agricultural implement designed for spreading and aerating hay to facilitate drying. This manual provides detailed assembly instructions, outlining the necessary tools, identifying components, and guiding the user through each step of the setup process.

Function Description:

The primary function of the Morra MH 530/420 tedder is to spread cut forage evenly across a field, promoting faster and more uniform drying. This is achieved through a series of rotating arms equipped with tines that gently lift and spread the hay. The tedder is designed to be towed by a tractor and utilizes a PTO (Power Take-Off) shaft for power transmission. Hydraulic cylinders are integrated into the design to allow for easy lifting and lowering of the arms, enabling transport and operational adjustments. A manual rope release system provides an alternative or supplementary method for controlling the arm position.

Important Technical Specifications:

The assembly process requires a specific set of tools, indicating the types of fasteners and components used in the tedder's construction. These include:

• Wrenches and Sockets: 8 mm hex key wrench, 13 mm socket, 17 mm socket, 19 mm socket, 22 mm socket, 24 mm socket, 35 mm socket, 19 mm wrench, 27 mm wrench. These sizes suggest the use of various bolts, nuts, and hex-head screws throughout the assembly, particularly for securing structural components, gearboxes, and hydraulic fittings.
• Hydraulic System: The tedder incorporates a hydraulic system for arm control. This system includes hydraulic hoses, a valve, adapters, brass washers, and a tractor-end fitting. The valve is installed onto the longest hydraulic hose using a 19 mm wrench, and the hose adapter is screwed into the valve using a 27 mm wrench. Short hoses connect to the main hose via a compression tee fitting, requiring a 19 mm wrench and pipe dope for secure connections. Brass washers are crucial for creating a tight seal at the cylinder connections.
• Power Transmission: A PTO shaft is used to transmit power from the tractor to the tedder's central unit. The assembly instructions emphasize attaching a safety cover around the input shaft before connecting the PTO shaft, highlighting a critical safety feature.
• Structural Components: Key structural components include the central unit, right and left arms, a tongue, support structures, outer wheels, and guards. The arms are attached to the central unit via yokes, which require careful alignment with keyways on the shaft. The rotor housing and gearboxes are central to the tedder's operation, with covers secured by bolts.
• Tines: The tines, which are responsible for spreading the hay, are pre-mounted on the arms. The instructions stress ensuring the arms are mounted so that the tines face the correct direction for optimal performance.

Usage Features:

• Arm Control: The tedder features hydraulic cylinders for lifting and lowering the arms, providing convenient control from the tractor. A manual rope release system offers an additional method for arm manipulation, allowing for flexibility in operation.
• Adjustability: The tongue attachment allows for pivoting on its bolts, suggesting some degree of adjustability for hitching or field operation. The leveling jack further aids in stabilizing and adjusting the unit.
• Transport Position: The ability to lift the arms into an upright position and lock them in place with the hydraulic cylinder indicates a dedicated transport mode, making it easier to move the tedder between fields or for storage.
• Timing of Rake Teeth: The instructions highlight the importance of "timing" the unit to ensure that the inner and outer rake teeth do not collide during operation. This suggests a design that requires precise alignment for smooth and efficient performance.

Maintenance Features:

• Greasing Points: The manual explicitly mentions several points requiring lubrication. It is recommended to grease the jack before installation and to put grease in the dust caps of the outer wheel bearings, even though the bearings are sealed. The universal joints on the arms also require greasing. This indicates a design that prioritizes regular lubrication for longevity and smooth operation.
• Paint Removal for Fit: The instructions advise removing paint with emery cloth from the shaft and yokes before attaching the arms to the central unit. This suggests that tight tolerances are critical for proper fitting and operation, and excess paint could hinder assembly or cause premature wear.
• Clearing Grease Holes: Users are instructed to ensure that grease holes are not clogged and to blow them out with an air gun if necessary. This emphasizes the importance of clear grease passages for effective lubrication.
• Grinding for Fit: In some cases, if welds are too large, the edges of the gearbox cover may need to be ground to fit properly. This indicates a potential for manufacturing variations and the need for minor adjustments during assembly to ensure proper component fit.
• Rubber Pads: The presence of rubber pads that need to be removed before attaching the arms and then replaced suggests a protective or dampening function, which may require periodic inspection or replacement.