Spring ZP 01.626 (on half-coupling)

ZP 01.626 Reverse Gear Clutch Spring

The ZP 01.626 spring is a power elastic element of the ZP 01.220 reverse gear control assembly, which ensures the transmission of torque to the driving wheels of the grain thrower. This part is an integral component of the running gear system on both classic ZM-60 and ZM-60A machines, as well as modern modernized ZM-60U and ZM-90U units.

The primary engineering task of this spring is to constantly and firmly press the moving jaw half-clutch against the wheel hub. It is precisely due to the expansion force created by the ZP 01.626 spring that the clutch jaws are securely held in engagement, allowing the machine to move confidently across the threshing floor area during technological operations. On the reverse side, the spring rests firmly against a special ZM 01.435 stamped washer, which serves as its support base.

When the operator needs to manually roll the unit or take it in tow, they pull the clutch toward themselves, overcoming the mechanical resistance of this specific spring. This breaks the rigid connection between the gearbox and the wheels, protecting the self-propelling mechanism from damage.

Technical Specifications of the ZP 01.626 Spring

• Catalog number: ZP 01.626
• Application: ZM-60, ZM-60A, ZM-60U, ZM-90U
• Installation assembly: Rear drive ZP 01.220 (jaw clutch mechanism)
• Part type: Cylindrical helical compression spring
• Quantity: 1 or 4 pcs. (depending on modification)
• Material: P-3 spring steel wire
• Weight: 0.035 kg

Structurally, the ZP 01.626 part is a classic helical compression spring with an open coil pitch. It is manufactured from specialized 3 mm diameter spring wire that undergoes appropriate thermal treatment to maintain its elastic properties over numerous operating cycles. The stiffness of this spring is calculated with high precision—it must generate sufficient axial pressure to prevent the clutch jaws from accidentally disengaging during the movement of the heavy grain thrower, while still allowing the operator to manually pull the clutch without using auxiliary levers.

The terminal support coils of the spring are tightly fitted against each other, forming a flat plane. This is an important engineering nuance that allows the entire surface of the spring end to press against the ZM 01.435 stamped washer on one side and directly into the body of the moving half-clutch on the other. Due to this geometry, the load is transmitted strictly along the axis of the shaft, completely eliminating radial distortion of the spring or its jamming on the half-axle during operation.

Regarding the quantity of these springs per unit, it is not fixed and depends directly on the kinematic reverse layout of your machine. If you are repairing classic previous-generation equipment (classic ZM-60 or ZM-60A models), you will only need one ZP 01.626 spring for the entire machine. This is because the older self-propelling mechanism features a differential in the gearbox, meaning the jaw clutch assembly for wheel unlocking during towing was installed asymmetrically—only on the left half-axle. Conversely, in modern upgraded units (such as our ZM-60U and ZM-90U), engineers implemented a more reliable symmetric reverse drive layout, where the disconnection mechanisms are duplicated on both driving wheels to reliably protect the gearbox from damage during machine transport. Accordingly, for proper maintenance or replacement of the locking mechanism on newer grain throwers, you will need two such springs—one for each half-axle.

Associated Parts of the ZP 01.626 Clutch Spring

Within the kinematic scheme of the reverse disconnection mechanism, the ZP 01.626 spring operates in close mechanical coordination with other power and guiding elements. When replacing this spring or performing a general inspection of the assembly, it is essential to check the condition of the following adjacent parts:

• Support washer ZM 01.435
• Half-clutch ZM 01.102
• Wheel hub ZM 01.180
• Reverse gear shaft ZP 01.625
• Manual locking elements (latch, button, and its small spring)

The reverse gear jaw clutch mechanism is an assembly frequently subjected to "homebrew engineering"—in field conditions, upon losing or sagging of the original spring, operators frequently install any random spring found in the workshop. This disrupts the engineered kinematics of the assembly. If a makeshift spring is too soft, it fails to hold the half-clutch in engagement; under operating loads or due to vibrations, the jaws can spontaneously disengage, causing the grain thrower to slip or lose drive entirely. On the other hand, installing an excessively stiff spring prevents the operator from manually pulling the half-clutch to disengage it. As a result, personnel often neglect operating rules and tow the unit across the floor with the wheels engaged. Through the rigid linkage, this leads to shearing safety pins or breaking the self-propelling gearbox (if the latter were also "modified").

The original ZP 01.626 spring from Zavod Moroza features an ideally calibrated stiffness balance that ensures reliable engagement while allowing effortless manual drive unlocking. However, we fully recognize that on many older or retrofitted units, shafts may have custom diameters, retaining rings shifted, and half-clutches feature non-standard seating depths. If your assembly geometry was altered during previous repairs, our company is ready to manufacture springs according to your custom drawings or samples. We can coil a spring from thicker wire to increase force, modify its overall length, coil pitch, or outer diameter so that it fits your modified shaft perfectly and guarantees entirely trouble-free drive operation.

Buying the ZP 01.626 Spring for Grain Throwers

Zavod Moroza built its manufacturing on continuous, direct dialogue with engineers and machine operators at agricultural enterprises. We deeply understand the harsh realities of operating equipment on the threshing floor and know the consequences of forced field repairs. Operational practice proves that installing random, uncalibrated springs into the jaw clutch mechanism leads either to machine slippage under operating load or the inability to manually unlock the wheels, which in turn can end in self-propelling gearbox failures during towing when required safety pins are missing. Using the original ZP 01.626 spring with standardized compression force completely eliminates these risks.

At the same time, we understand that wear in the wheel disconnection mechanism is rarely isolated. If the shaft grooves, moving half-clutch jaws, or hubs on your unit are critically worn, replacing only the spring will not restore proper locking. For such cases, we offer fully assembled half-axles or the complete ZP 01.220 rear-drive unit. This approach enables the rapid restoration of correct factory running gear kinematics without wasting time on fitting or restoring worn elements.

Contact our sales department for professional technical consultation and order placement. We will analyze your grain thrower's configuration (at a minimum, whether it utilizes the classic asymmetric layout or the modern upgraded dual-clutch setup) and accurately equip your machine. Choose reliable engineering solutions from the manufacturer to guarantee restored drive control and stable equipment performance for many seasons ahead.