Screw ZP 01.070 + Nut ZP 01.101

Screw ZP 01.070 + Nut ZP 01.101 for ZM-60U/90U/120U + ZMB

The set consisting of the power screw ZP 01.070 and the special support nut ZP 01.101 forms the basic screw pair of the front travel lifting mechanism (ZP 01.020) on modernized ZM series (ZM-60U, ZM-90U, ZM-120U) and ZMB series (ZMB-90U, ZMB-120U) grain loaders. This tandem of parts is the main link in the assembly, absorbing the static and dynamic mass of the unit's front frame during the vertical movement of the inner fork and wheelbase. Receiving torque from the manual drive, the trapezoidal thread of the screw interacts with the internal profile of the nut, converting rotational movement into linear vertical travel. This allows the machine operator to adjust the working clearance of the feeders above the threshing floor or raise the frame for free transportation of the machine.

From an engineering standpoint, replacing these parts as a single set is a technically sound solution during undercarriage repair. Installing a new screw into a worn nut (or vice versa) causes a mismatch in thread profiles, accelerated metal abrasion, and increases the risk of shaft jamming under load. Simultaneously replacing both components ensures proper initial engagement of the trapezoidal thread, eliminates the formation of initial play, and guarantees smooth operation of the lifting assembly without excessive effort from the operator.

Technical Specifications of the Screw Pair (ZP 01.070 and ZP 01.101)

• Set includes: Front travel screw (ZP 01.070) and special nut (ZP 01.101)
• Application: ZM-60U, ZM-90U, ZM-120U, ZMB-90U, ZMB-120U
• Thread Type: Trapezoidal self-locking thread
• Screw Material: Structural steel
• Nut Material: Anti-friction grey cast iron (SCh 20), optionally - steel
• Quantity per unit: 1 set
• Country of Manufacture: Ukraine

The foundation of this assembly's working life is the correct selection of materials and thread profile. The trapezoidal thread has a deep profile and an increased contact area of the threads, which allows for uniform distribution of high axial loads from the mass of the unit's front part. In addition to strength, such a thread possesses self-locking properties — it reliably maintains the set frame height without the need for additional locking mechanisms, preventing involuntary lowering of the feeders.

In the standard factory configuration, the steel screw works in tandem with a grey cast iron nut, forming a classic "steel-cast iron" friction pair. The microstructure of cast iron contains graphite inclusions that act as a solid lubricant under load — this reduces the overall coefficient of friction and prevents galling on the threads even under conditions of oil starvation. In the realities of work on a threshing floor, this property is particularly important, because excessive application of heavy greases (such as Litol or grease) to the thread quickly leads to the adhesion of grain dust and sand — this mixture then turns into an abrasive paste that acts like sandpaper and destroys the metal. That is why a cast iron nut is less demanding regarding external lubrication and maintains smooth shaft movement without excess grease. However, for machines that operate more extremely, on broken sites with frequent impact and vibration loads (where brittle cast iron may crack), we can manufacture sets with a reinforced steel nut. Since a "steel-on-steel" friction pair has higher resistance and is more prone to seizing (thread jamming), this modification requires stricter lubrication control. To avoid dry friction, we cut additional lubrication grooves on the internal profile of the steel nut, which accumulate and retain grease directly in the contact zone, isolating it from external dust.

Related Lifting Mechanism (Jack) Parts and Shaft Modifications

For a full capital repair of the height adjustment system, in addition to the basic screw pair, revision and replacement of adjacent components are usually required. According to the kinematic scheme of the front travel, this assembly also includes:

• Drive handle ZP 01.060
• Ratchet pawl ZP 01.401
• Inner fork ZP 01.040
• Outer fork ZP 01.050
• Thrust bearing 8104 GOST 520-2002
• Auxiliary fastening elements: pins, retaining rings, washers, and bolts

An important element of the screw ZP 01.070 is the ratchet wheel (daisy wheel), which is installed on its upper shank. In the standard factory execution, the daisy wheel is rigidly welded to the shaft — this process takes place in special spatial jigs to ensure strict perpendicularity between the tooth plane and the axis of the part. The absence of axial runout guarantees that the reversible pawl will precisely enter the ratchet hollows, transmitting rotational force to the screw pair without lever slippage. Depending on the operating conditions and the state of your equipment, the screw configuration can be changed. For units with non-standard wheelbases or modified frames, it is possible to manufacture a shaft of a different length to maintain a sufficient range of lowering and lifting the feeders. Furthermore, the ratchet wheel mounting assembly can be made in a detachable version — a square profile or a keyway is machined on the shank, which significantly simplifies the disassembly of the daisy wheel from above if necessary. If such a profile or keyway connection is additionally welded, an ultra-durable structure is formed, calculated for extreme torsional loads during height adjustment on uneven surfaces.

Buy Screw ZP 01.070 and Nut ZP 01.101 (Grain Loader Screw Pair)

You can order the screw pair for the ZM and ZMB grain loader height adjustment mechanism directly from Zavod Moroza. We guarantee perfect fitting of the trapezoidal thread at the turning production stage, which saves you from problems with parts jamming during installation on the threshing floor. All standard sets and related elements are kept in stock for fast shipping. Contact our sales department — we are thoroughly versed in the technical nuances of machines from various years of production and will help avoid any unpleasant surprises during the repair of your equipment.