ZP 01.625 Reverse Shaft (Upgraded, for Symmetric Drive)

ZP 01.625 Reverse Shaft (Upgraded, for Symmetric Drive)

The ZP 01.625 reverse shaft (upgraded symmetric half-axle) is the central power transmission element of the ZP 01.220 running gear mechanism, utilized on our modern, high-performance ZM-60U and ZM-90U grain thrower series and analog wheeled loaders. It acts as the driving half-axle of the rear axle, directly ensuring torque transmission from the self-propelled gearbox via a chain drive to the wheel unit, while also controlling the prompt engagement and disengagement of the wheels using a cam clutch.

In the modern symmetric rear axle transmission system-which serves as the baseline for the new generation of machinery from Zavod Moroza-this shaft is installed symmetrically on both sides of the running gear. This allows the operator to completely disengage the kinematic connection between both driving wheels and the self-propelled gearbox during towing or manual repositioning across the threshing floor. Consequently, harmful parasitic loads are entirely removed from the internal gears and planetary differentials of the transmission, shielding the gearbox from premature wear and easing machine maneuverability.

Engineering Advantages and Design Modifications of the ZP 01.625 Shaft

The origin of this component is directly linked to practical field experience among farmers and failure analysis. In legacy classic reverse gear designs, shafts featured numerous vulnerabilities, including numerous minor grooves for retaining circlips and drilled holes for safety pins. Due to constant alternating loads, shocks when starting the grain thrower from a standstill, and jolts over uneven terrain, these grooves and holes served as stress concentration points. The metal in these zones fatigued rapidly, leading to shaft deformation, enlarged seating bores, or even axis jamming right in the middle of operations. Furthermore, frequent shearing of the drive sprocket safety pins forced operators to modify and reinforce shafts themselves under farm conditions by welding on metal or milling custom keyways. Our design engineers thoroughly analyzed these and similar modifications, creating a new, optimized shaft free of structural vulnerabilities that boasts significantly increased strength and simplified geometry.

The primary design modification of the upgraded ZP 01.625 shaft is the complete elimination of weak ring grooves designed for retaining circlips. In the legacy layout, the ZP 01.340 drive sprocket was secured on a smooth shaft using two spring rings in specialized grooves; the new design completely eliminates these risk zones since the sprocket now features secure keyed mounting with a rigid set screw, rendering thin shaft grooves unnecessary. This preserves the monolithic structure of the 30 mm steel bar and substantially increases its resistance to deformation.

The updated configuration of keyways and fastening holes renders this shaft considerably more technological and reliable. Instead of numerous scattered holes, precisely calculated, optimized keyways are machined into the shaft. Additionally, an effective engineering solution is implemented in the zone of the ZP 01.102 cam half-clutch: one of the extended keyways serves a dual function as a guide for the prismatic key while simultaneously acting as the seating detent (pocket) for the latch pin. When the half-clutch is retracted to its extreme idle position, the spring-loaded nose of the latch drops directly into this shaft indentation, ensuring crisp and stable clutch locking in idle mode without requiring additional deep detents that weaken the cross-section of the axle.

Furthermore, in legacy asymmetric designs, the left and right reverse shafts differed substantially in geometry and function-one side featured a cam disengagement mechanism, while the other remained "blind." Under real operational conditions, this created considerable inconveniences during maneuvering and forced farms to purchase and stock entirely different catalog parts. In practice, resourceful farmers attempted to modify and rework old bridges themselves to obtain identical half-axles on both sides. Zavod Moroza designers implemented this demand at the manufacturing level long ago: the running gear now utilizes completely identical, unified ZP 01.625 shafts. This modern engineering standard significantly simplifies repairs and parts sourcing, while allowing both wheels to be fully disconnected from the transmission for effortless, smooth machine travel across any surface.

Technical Specifications of the Upgraded ZP 01.625 Shaft

• Catalog number - ZP 01.625 (upgraded keyed variant).
• Application - ZM-60U, ZM-90U grain throwers and their equivalents, as well as for modernizing classic ZM-60 grain throwers.
• Installation assembly - ZP 01.220 reverse drive (left and right driving half-axles).
• Purpose - absorption of radial and torsional loads, stable torque transmission from the self-propelled gearbox roller chain to the driving wheel with the capability for complete transmission disengagement.
• Seating diameter - 30 mm (precision ground for 11206 spherical bearings and hub cermet bushings).
• Manufacturing material - high-grade Grade 45 structural carbon steel featuring localized thermal hardening of working zones.
• Fastener type - optimized keyed connections (prismatic 8x7 mm keyways) free of weakening circular grooves.
• Component weight - 4.98 kg.

Buying the Upgraded ZP 01.625 Reverse Shaft from Zavod Moroza

Zavod Moroza is a full-cycle modern machine-building enterprise. We refine every component based on years of agricultural machinery servicing under real Ukrainian farm conditions. Our upgraded ZP 01.625 reverse shafts are machined from certified high-strength rolled steel. Working surfaces for hub sliding bearings and supporting spherical bearings undergo high-precision CNC grinding, guaranteeing flawless seating of mating components with zero backlash and effortless half-clutch sliding when shifting into transport mode.

For maximum convenience and flexibility in selection, we offer several configuration and ordering options tailored to your farm's individual needs. If you require a targeted replacement of a worn element, you can purchase an individual upgraded ZP 01.625 shaft as a standalone part. In the standard factory configuration, it is manufactured from durable structural steel, and upon request, we can readily equip it with all necessary prismatic keys and fastening hardware. Additionally, for farms operating under elevated load conditions that seek a maximum safety margin, we offer the option of manufacturing the shaft from high-strength alloy steel, where the addition of special alloying elements (chromium and manganese) imparts extraordinary resistance to bending and torsion, rendering its keyways virtually immune to crushing and deformation under shock loads.

However, the most sought-after and convenient format for rapid field repairs is a pre-assembled left or right reverse half-axle. Choosing this option delivers a fully equipped running unit professionally assembled on our factory test bench. Its composition already includes the upgraded shaft, reinforced ZM 01.180 cam hub with pressed-in cermet bushings, ZP 01.102 half-clutch with latch, heavy-duty spring, ZP 01.360 sprocket, and 11206 support bearings housed within robust H 026.058 cast-iron housings. Installing this assembled module requires minimal time, involves no complex locksmith or fitting procedures, and instantly returns grain cleaning machinery to service-an invaluable asset during peak harvest seasons.

For agricultural operators seeking a major overhaul of their running gear to permanently eliminate the chronic issues of older ZM-60 or ZM-60A models, our complete symmetric drive conversion kit serves as an ideal engineering solution. Within this comprehensive upgrade, we supply two fully equipped mirror-symmetric shafts assembled with cam disengagers for both wheels and new ZPT 1.6.2 wheels (or enlarged 500 mm ZPT 1.6.3 wheels). Transitioning to this modern symmetric standard permanently eradicates the vulnerable pin system, greatly simplifies maneuvering across the threshing floor, and shields the self-propelled gearbox from premature wear by enabling total wheel disconnection during transport or towing.

Simply contact our managers before making a purchase! They will gladly assist in verifying shaft compatibility with your machinery, recommend the optimal grain thrower modernization option, and organize prompt spare parts dispatch directly from the manufacturer's warehouse!