A30 Washer for the Reverse Disengagement Mechanism

A30 Washer for the Reverse Disengagement Mechanism

The thrust washer is an essential auxiliary component in the control assembly of the ZP 01.220 reverse disengagement mechanism. It is utilized on self-propelled ZM-60U and ZM-90U grain thrower series and can also be installed on ZM-60/60A modifications as a replacement for the stamped ZM 01.435 washer. The primary function of this component is to provide a secure and even bearing surface for the ZP 01.626 heavy-duty spring-which presses the ZP 01.102 cam half-clutch against the drive wheel hub on one side-while serving as a reliable end stop to secure components at the opposite end of the shaft, where it is likewise retained by a cotter pin to prevent axial displacement of the entire drive assembly.

Technical Specifications and Geometric Parameters

The A30 washer is manufactured in accordance with the requirements of state standard GOST 11371-78 (international equivalent: ISO 7089) and represents a flat circular Class "A" component, guaranteeing high geometric precision and minimal surface roughness.

Key technical parameters of the product:

• Inner diameter - 31.0 mm (ensures a precise fit on the 30 mm ZP 01.625 shaft with the necessary technological clearance for free positioning).
• Outer diameter - 56.0 mm (creates an optimal bearing area for the end coil of the ZP 01.626 heavy-duty spring).
• Component thickness - 4.0 mm (precludes washer deformation under continuous axial force).
• Material - high-grade 08kp structural carbon steel.
• Protective coating - galvanic zinc plating 9 µm thick with chromate passivation, reliably protecting the steel against corrosion in high-humidity threshing floor environments.

Advantages of the Flat A30 Washer Over the Legacy ZM 01.435

The primary advantage of transitioning to the standardized flat A30 washer lies in its structural simplicity and full interchangeability during repairs. The legacy original ZM 01.435 component featured a specific cup-like shape that is virtually impossible to locate in conventional hardware stores or on a farm if misplaced during field maintenance. Conversely, the A30 washer is a universally accepted standard-it is an exceptionally straightforward and clear hardware item with a 31 mm inner diameter that can easily be acquired at any spare parts store when needed. It fits seamlessly onto any 30 mm diameter shaft, rendering running gear repairs rapid and freeing the enterprise from the need to order scarce, custom-shaped small parts.

Furthermore, the new washer provides significantly higher resistance to mechanical deformation during operation. The old cup-shaped component was stamped from relatively thin sheet metal, meaning that under the continuous powerful pressure of the compressed ZP 01.626 spring, its edges could warp into a dish shape over time, leading to coil skewing and a reduction in clutch clamping force. The monolithic 40 mm thick A30 washer is fabricated from solid rolled steel and possesses colossal rigidity; it is guaranteed not to deform or flex even under maximum spring compression during manual wheel drive disengagement, preserving the operational stability of the entire assembly.

Another significant advantage is the component's high-quality anti-corrosion protection. Unlike old stamped washers, which frequently shipped uncoated and rapidly rusted from moisture and dust at the threshing floor, the A30 washer undergoes mandatory galvanic zinc plating. A 9-micron zinc layer reliably isolates the steel from oxidation, enabling the component to maintain smooth surfaces and avoid obstructing the free rotation and movement of adjacent cam mechanism elements.

Associated Small Parts for Reverse Axle Repair and Maintenance

During the replacement or servicing of A30 thrust washers within the reverse disengagement assembly, the need typically arises to renew other small fastening and securing hardware. Because these elements operate continuously amidst dust, moisture, and alternating vibrations at the threshing floor, they are subject to natural wear, deformation, or simple loss during assembly teardown and inspection.

Ordering one or two washers individually is frequently impractical for both parties, as postal shipping costs will significantly exceed the price of the parts themselves. Consequently, verifying the condition of the entire small hardware group of the rear axle in advance and acquiring the necessary elements comprehensively to establish a reliable internal enterprise spare parts reserve (ZIP) is vastly more rational. Our warehouse consistently maintains a full spectrum of original associated components:

• 6.3x50 mounting cotter pins (GOST 397-79) - serve as the end safety lock for the ZP 01.625 shaft, securely retaining the A30 washer on the half-axle and counteracting the axial pressure of the compressed spring.
• Prismatic keys (GOST 23360-78 standard) - precision 8x7x35 mm keys (for free longitudinal sliding of the ZP 01.102 half-clutch) and longer 8x7x50 mm keys (for rigid fixation of drive sprockets on keyed shaft modifications).
• ZP 01.646 safety shear pins - calibrated steel 35 pins featuring a precisely calculated shear strength limit, intended for emergency transmission protection on classic asymmetric running shafts (where sprockets mount without keys).
• Reinforced M12x45 wheel bolts (strength class 8.8) complete with nuts and spring washers for secure, geometrically precise fixation of wheel disks to ZM 01.180 hub flanges.
• Bearing support fasteners - sets of M8x25 and M8x45 bolts with matching lock washers for tightly clamping H 026.163 cast-iron covers and H 026.058 bearing housings.
• Any other hardware items.

We do not restrict ourselves to components solely for the grain thrower's reverse drive and are fully prepared to supply your enterprise with small hardware for any other agricultural machine assemblies. We consistently stock fastening bolts across various strength classes, nuts, washers, retaining rings, connecting and transition links for trimmer and conveyor drive chains, as well as prismatic keys for gearboxes, pulleys, and drums. You can simply dictate the complete list of required hardware to our specialist, and we will package it into a single joint shipment alongside larger assemblies.

Buying Washers and Other Agricultural Machinery Components from Zavod Moroza

We know from our own practical experience that the uninterrupted operation of agricultural machinery frequently depends on the smallest details. Starting from galvanized A30 thrust washers that withstand the constant load of disengagement springs, all the way to keys, cotter pins, and high-strength bolts-every minor detail within the kinematic layout must function flawlessly. As a manufacturing plant, we build machinery with a clear understanding of all nuances of its daily operation. We independently design and construct complex machines, and thus fully comprehend that a shear pin broken due to metal fatigue or a key lost during field repairs can immobilize an entire machine. We devote special attention to the quality of the smallest hardware item, because the overall resource of assemblies is comprised of such details.

All necessary fastening and securing elements are consistently available in our warehouses. If the time has come for your machinery fleet to renew working components or supplement individual quick-response repair kits (ZIPs) for prompt troubleshooting directly at the threshing floor or in the field, our enterprise will fully supply you with proven spare parts.

The manufacturing capabilities of Zavod Moroza enable the production of reliable components and turnkey solutions not only for ZM series grain throwers and OVS grain cleaners. We serially manufacture high-quality spare parts for PTS tractor trailers, elevator bucket elevators, tine harrows, and rollers, alongside numerous other types of agricultural equipment. Our engineering approach guarantees strict adherence to operating clearances, machining precision, and ideal component compatibility during installation.

Choose uncompromising quality and purchase spare parts directly from the Ukrainian manufacturer! Call, submit your inquiry, or leave a request on our website, and our engineers will assist in selecting any components-from power transmission assemblies to small associated fasteners-tailored to your farm's requirements!