Screw ZP 01.070 + special nut ZP 01.101

Screw ZP 01.070 + special nut ZP 01.101

The kit consisting of the front travel screw ZP 01.070 and the special nut ZP 01.101 is that same basic screw pair which forms the power foundation of the front travel position adjustment mechanism ZP 01.020 of the ZM-60/60A series grain loaders and their modifications. This working tandem acts as the main supporting link of the lifting assembly, fully taking on the mass of the front section of the unit during the vertical movement of the inner yoke ZP 01.040 with the wheel. Purchasing these two parts as a single kit guarantees the perfect mating of the new trapezoidal thread of the shaft with the inner profile of the nut, eliminating the appearance of initial play. Receiving torque from the manual drive, the screw smoothly passes through the nut, transforming the rotational movement into a precise vertical travel. The flawless operation of such a screw pair allows the operator to conveniently adjust the lifting of the front section of the frame - to lower the scraper feeders as accurately as possible onto the surface of the threshing floor or warehouse for effective material pickup, or to raise them to a safe height for free maneuvering of the unit around the site.

Design features and kinematics of the screw pair ZP 01.070 + ZP 01.101

The basis of this repair kit is a massive threaded steel shaft, crowned with a welded ratchet wheel (Z-9 star wheel), and a special support nut (ZP 01.101). The main working zone of the tandem is the perfectly fitted trapezoidal thread - it is exactly this specific thread profile that guarantees the system a high load capacity and provides a locking effect. Due to this property, the mechanism reliably brakes the change of the set clearance of the front section and completely excludes spontaneous unwinding under the constant pressure of the unit's massive frame. The production of both components at the Zavod Moroza is carried out using robust rolled steel capable of withstanding intense axial loads without deformations.

In the kinematic scheme of the ZM-60 front travel, this screw pair works as the central effort transformation unit, where the special nut is fastened to the upper platform of the outer yoke. The shaft, with its threaded part, screws through it, and its lower base reaches the horizontal flange of the inner movable leg ZP 01.040. Receiving torque from the external manual drive (the handle with a pawl, which are installed on the ratchet), the screw executes a translational movement through the nut. Advancing downward, the rod rests against the inner yoke via transitional support elements (thrust bearings, bushings, or washers, depending on the modification) and pushes out the leg with the support wheel, forcing the front section of the grain loader to rise. Rotating the shaft in the reverse direction, on the contrary, gradually relieves this pressure, allowing the heavy metal structure to lower smoothly and in a controlled manner.

Repair features related to the screw ZP 01.070 and nut ZP 01.101

Replacing the screw and the special nut as a single kit is the basic rule of high-quality maintenance of grain loader lifting mechanisms. Since these two parts work in constant close contact under the weight of the machine, their wear always occurs symmetrically. If you try to save money and screw a new shaft into an old, battered nut (or vice versa), the existing play and abrasive residues will begin to destroy the fresh metal more quickly. Purchasing a ready-made screw pair from the Zavod Moroza solves this problem right from the start - you get a perfectly fitted factory engagement of the trapezoidal thread, which guarantees the maximum working life of the renewed assembly.

At the same time, it is worth remembering that this tandem is supplied as a power base (a shaft with a welded star wheel and a special nut), but for the full functioning of the mechanism and torque transmission, the system must be supplemented with manual drive elements. For a major restoration of the front travel, we offer all the necessary associated spare parts:

• Handle ZP 01.060
• Safety pawl ZP 01.401
• Outer front travel yoke ZP 01.050
• Inner front travel yoke ZP 01.040
• Support elements (a system of bushings, thrust washers, or bearings)
• Small consumables (locking cotter pins, grease nipples, pins, and threaded connections)

The flexibility of our catalogue allows you to select the optimal option for any farm needs. You can limit yourself to buying only the screw pair if the other drive elements remain in excellent condition. However, a comprehensive renewal of the entire working linkage of parts significantly saves time on disassembling the unit and is guaranteed to protect the new spare parts from accelerated destruction by old components.

Factory modifications and compatibility of the screw ZP 01.070 and nut ZP 01.101 assembly

Historically, the design of the front travel of grain loaders had several execution variants, therefore our basic screw pair is designed with maximum universality in mind. Depending on the year of manufacture and the manufacturing plant of the unit, the seating locations on the steering yokes can differ significantly. For example, in some kinematic schemes, the function of a classic nut is performed by a special massive bearing housing with an internal trapezoidal thread. The standard nut ZP 01.101 itself is most often mounted to the platform of the outer yoke using bolted connections, while at the same time in many farms, after artisanal repairs, rigid welding of the nut to the frame is encountered. The dimensions and tolerances of our screw pair allow it to be seamlessly integrated into any of these systems, regardless of the mounting type and yoke format.

Special attention is required to prepare the mechanism for the off-season, when the lifting assembly often suffers from thread jamming, which is especially relevant after prolonged winter storage of equipment outdoors. So that the screw does not turn out to be dead-stuck to the nut in the spring, some designs of the support assemblies feature grease nipples and lubrication channels. Regular syringing of the screw pair with fresh solid oil or lithol reliably preserves the metal, pushing out accumulated moisture and abrasive dust, thanks to which the mechanism retains perfect smoothness of travel.

The specialists of the Zavod Moroza perfectly understand the specifics of "folk" modernizations, so we are always ready to fulfill non-standard requests. In addition to manufacturing screws of individual length for a reworked front travel or frame, it is possible to create shafts with a modified ratchet fastening system, where, for example, instead of classic rigid welding, the upper part of the screw can be milled for a keyway or a hexagonal fit, where the star wheel is simply slipped on top and secured with an end bolt or a locking cotter pin. Such a solution allows instantaneous replacement of a worn ratchet wheel right in the field without an angle grinder, although, at the operator's desire, such a removable part can always be additionally welded for absolute monolithicity.

Main causes of wear and critical breakdowns of the screw pair

The specific nature of work on the threshing floor implies constant contact of open mechanisms with fine debris and grain dust. Settling on the lubricated turns of the trapezoidal thread, this dirt mixes with lubricant residues and forms an aggressive abrasive paste - with each rotation of the shaft, this mixture acts like sandpaper, methodically grinding away the metal both on the screw ZP 01.070 itself and inside the special nut ZP 01.101. The gradual thinning of the profile leads to the system losing its self-braking effect, and the front section of the machine begins to sag spontaneously from vibrations during operation or transportation.

In addition to natural friction, the screw pair ZP 01.070 + ZP 01.101 is extremely vulnerable to dynamic shocks. The grain loader is a massive and heavy unit, and during its movement around the site, the entire weight of the front section is concentrated precisely on this threaded assembly. Harsh impacts on deep potholes, crossings over high thresholds of storage facilities, or unexpected strikes against concrete ruts transmit a colossal impulse from the support wheel through the inner yoke straight to the screw and nut - such sudden overloads are capable of shearing the remaining threads inside the nut or critically bending the axis of the steel shaft itself.

A significant portion of breakdowns is also the result of operating rule violations and the human factor. If, due to the lack of timely lubrication, the yoke guides jam after a winter downtime, operators often try to force the mechanism through, applying extreme effort to the lever. Such an overload leads to the deformation of seating locations and irreversible destruction of the threaded connection. Attempts to restore a battered assembly in garage conditions (by welding new metal onto a stripped thread) are incapable of returning the correct trapezoidal geometry to the system. Replacing the screw and nut with a single new factory-made kit remains the only reliable option here for restoring the stable and safe operation of the unit.

Buy the screw pair ZP 01.070 + ZP 01.101 for the grain loader at the Zavod Moroza

The Zavod Moroza is an enterprise where the serial production of equipment, assemblies, and spare parts is inextricably linked with live agrarian practice. Our designers and leading specialists have real experience working directly on threshing floors and in the field, therefore we thoroughly know all the harsh subtleties of domestic equipment operation realities. Over the years of work, we have personally observed and worked on the evolution of grain loaders, therefore we perfectly understand how design approaches changed and loads increased, including on the lifting assemblies. Thanks to this deep understanding of the problems from the inside, we abandoned the blind copying of old blueprints and currently produce robust power elements capable of confidently withstanding the modern intensive work paces of farms.

By purchasing the ready-made tandem of the screw ZP 01.070 and the special nut ZP 01.101 directly from the manufacturer, you are making a choice in favor of a perfectly fitted engagement of the trapezoidal thread. Strict lathe control at every stage guarantees the absence of initial play and maximum smoothness of travel. The Zavod Moroza is aimed at long-term and reliable cooperation with agrarian enterprises - we well know the value of time, especially at the height of the season, therefore we always maintain a necessary reserve of ready-made screw pairs in our warehouses and are ready to promptly meet needs in both standard parts and custom non-standard orders.

Return the ideal factory kinematics to your unit. Contact our technical department for a consultation - we will analyze the specifics of your machine, select the necessary configuration, and quickly dispatch the parts. Install a new screw pair and get rid of constant jamming, extremely stiff travel, and spontaneous sagging of the frame - this way you will ensure the stable, accurate, and safe execution of its tasks by the equipment under any loads.