ZP 01.220 Reverse Gear Assembly

ZP 01.220 Reverse Gear Assembly (Classic Asymmetric, With Wheels)

The ZP 01.220 reverse gear assembly with wheels is a fully integrated running unit responsible for the movement and maneuvering of classic serial ZM-60 grain throwers. The assembly mounts to the lower frame of the machine via four H 026.058 cast-iron bearing housings and serves to receive torque from the self-propelled gearbox through drive chains, transferring it directly to the driving wheels.

The structural foundation of this kit is the classic asymmetric drive layout, engineered for the ZP 07.000 single-speed self-propelled mechanism (a gearbox featuring an internal differential). The axle consists of two structurally distinct half-axles: the left drive half-axle, based on the ZP 01.625 shaft, is equipped with a ZP 01.102 cam clutch and a ZM 01.180 cam hub for quick travel disengagement during towing, while the right half-axle (the ZP 01.627 shaft) is blind and rigidly secured within the smooth ZM 01.104 hub via the ZP 14.502 locking plate. This item is supplied in maximum pre-assembled condition—complete with two ZPT 1.6.2 rubber-tired wheels (400 mm), drive sprockets (ZP 01.340 and ZP 01.360), 11206 spherical bearings, and sealing covers.

Supplying the reverse gear fully assembled with wheels is the most convenient solution for a comprehensive running gear restoration, allowing worn-out assemblies to be replaced with a ready-to-install kit without wasting time on bearing pressing, clearance adjustments, and tire mounting directly at the machinery's operation site. Zavod Moroza manufactures this unit with strict adherence to geometric tolerances, ensuring exact alignment of mounting points and reliable operation across all elements of the kinematic chain.

Technical Specifications of the ZP 01.220 Reverse Gear (Classic Asymmetric, Assembled with Wheels)

• Assembly designation: ZP 01.220 Reverse Gear
• Application: ZM-60 (classic serial machines)
• Drive layout: Asymmetric (left half-axle features a travel disengagement mechanism; right half-axle is blind)
• Shaft bore diameter: 30 mm
• Shaft material: Structural carbon steel (Steel 35)
• Support assemblies: 4 cast-iron housings H 026.058 (Sch 20) on mounting feet
• Bearings: Spherical double-row bearings 11206 (1207K + H207 tapered adapter sleeve set) — 4 pcs.
• Bearing chamber seals: Through cast-iron covers H 026.163 with clamped reinforced lip seals (30x52 mm oil seals) — 4 pcs.
• Drive sprockets: Z=25, pitch t=19.05 mm (for PRL-19.05 roller chain). Left sprocket ZP 01.340 features a 30 mm smooth bore secured with a ZP 01.646 shear pin. Right sprocket ZP 01.360 mounts on an 8x7 mm prismatic key with an M10 set screw.
• Wheel hubs: Left hub is a cam-type ZM 01.180 hub with two internal cermet bushings NEN 400003. Right hub is a blind ZM 01.104 hub with a flat face, secured by the ZP 14.502 plate.
• Drive disengagement mechanism: Cam half-clutch ZP 01.102, heavy-duty spring ZP 01.626, support washer ZM 01.435, and complete latch assembly ZP 01.631.
• Running wheels: 2 rubber-tired wheels ZPT 1.6.2 (400 mm diameter, 100 mm width, 6 mm steel disk, bandless IZ 2162 tire).

The divided kinematics of the asymmetric drive rely on two specialized 30 mm diameter half-axles. The left ZP 01.625 shaft features milled keyways for the sliding ZP 01.102 half-clutch, a spherical detent pocket for the ZP 01.631 latch pin, and radial holes for the ZM 01.435 washer cotter pins and the ZP 01.340 sprocket shear pin. The right ZP 01.627 half-axle features two extended keyways and a milled longitudinal pad for the ZP 14.502 locking plate. This combination ensures rigid torque transfer to the right wheel alongside the ability to disengage the left wheel during transport.

The protected support base built on four H 026.058 housings absorbs the static weight of the grain thrower's rear section and dynamic shocks encountered while traveling across uneven threshing floors. The internal 11206 bearings utilize a spherical raceway to self-align within the cast-iron housings, fully compensating for shaft deflections or minor misalignments during frame installation. To block abrasive grain dust, each of the four housings is factory-machined to house a 30x52 mm reinforced lip seal and is closed off with an H 026.163 through cast-iron cover, preventing lubricant leakage and shielding the bearing chamber.

The prepared disengagement assembly and drive protection ship with calibrated geometric clearances between the cams of the ZP 01.102 half-clutch and the ZM 01.180 hub. All spring-loaded elements are calibrated—the ZP 01.626 heavy-duty spring creates adequate tension to maintain engagement under load, while the small ZP 01.628 latch spring securely locks the clutch in the idle position. The inclusion of the ZP 01.646 shear pin on the left sprocket establishes a controlled safety link that fails during wheel jams, protecting the self-propelled gearbox gears from damage.

The complete ZPT 1.6.2 wheel base is mounted to the square hub flanges directly on factory test stands. The 6 mm thick steel disks resist face runout, and the massive IZ 2162 tires are tightly pressed onto the rims to prevent slippage during sharp turns. As a result, the assembled unit requires no additional fitting work or tire mounting—once the housing feet are secured to the frame and drive chains are tensioned, the running gear is fully ready for operation.

Full Contents of the ZP 01.220 Reverse Gear Kit (With Wheels)

Left Half-Axle Assembly (With Drive Disengagement Mechanism):

• Reverse shaft ZP 01.625 (30 mm bore with holes and latch detent pocket)
• Drive sprocket ZP 01.340 (Z=25, 19.05 mm pitch, configured for shear pin)
• Safety shear pin ZP 01.646 and retaining rings 6511 019
• Cam half-clutch ZP 01.102
• Heavy-duty spring ZP 01.626 and support washer ZM 01.435
• Latch assembly ZP 01.631 complete (guide bushing ZP 01.632, small spring ZP 01.628, release button ZP 01.629)
• Cam-type wheel hub ZM 01.180
• Pressed-in cermet bushings NEN 400003 (2 pcs.)
• Spacer ring kit 30 ZM 01.623 (complete with VM10 set screw and 50P spring ring)

Right Half-Axle Assembly (Rigid Drive):

• Reverse shaft ZP 01.627 (featuring locking plate pad and keyways)
• Drive sprocket ZP 01.360 (Z=25, 19.05 mm pitch, for 8x7 mm key and M10 set screw)
• Blind wheel hub ZM 01.104 (with flat face)
• Locking plate ZP 14.502 with two M8x16 bolts and washers

Support and Bearing Group (For Both Half-Axles):

• Cast-iron bearing housings H 026.058 on mounting feet (4 pcs.)
• Spherical double-row bearings 11206 with H207 tapered adapter sleeves (4 pcs.)
• Through cast-iron bearing covers H 026.163 (4 pcs.)
• Reinforced rubber lip seals (30x52 mm oil seals) — 8 pcs.
• Grease zerks for lubrication

Wheel Kit:

• Rubber-tired wheels ZPT 1.6.2 (400 mm diameter, 6 mm steel disk, pressed-on IZ 2162 tire) — 2 pcs.
• M12 mounting bolts with nuts and washers for securing wheels to hub flanges

This reverse gear configuration serves as the baseline for classic Soviet-designed grain throwers (ZM-60), which were manufactured by numerous plants over several decades. Throughout years of operation, this equipment underwent numerous factory modifications, and during overhauls, farms frequently subjected the assembly to improvised field engineering. Consequently, grain throwers operating on threshing floors today feature diverse component configurations—ranging from original factory builds to heavily altered custom half-axles.

The classic factory ZM-60 drive utilized an asymmetric layout: the left half-axle featured a cam disengagement clutch while the right remained blind, engineered for single-speed gearboxes with internal differentials where only one side was uncoupled for turns or towing. Nonetheless, during towing, the right wheel still spun and forced the differential satellite gears inside the gearbox to rotate, creating additional resistance. To completely eliminate this parasitic load on the transmission, many farms modernize their grain throwers by discarding the blind ZM 01.627 shaft and ZM 01.104 hub, converting the reverse gear to a symmetric layout featuring two identical ZP 01.625 cam half-axles and dual clutches.

Depending on the manufacturing year and specific maker, the steel shafts themselves exhibit notable differences. For instance, the catalog keyway for the ZP 01.102 clutch was originally manufactured short, whereas in practice it is often milled longer to facilitate smoother longitudinal travel during disengagement. Shafts may also include or omit the spherical latch detent pocket, vary in groove placement for 6511 019 retaining rings, or feature different radial hole diameters for the ZM 01.435 washer cotter pins. The same applies to drive sprockets: the left ZP 01.340 sprocket is standardly secured by a "soft" ZP 01.646 shear pin, yet in many agricultural operations, its bore wears out and the part is rebored to accept a key or hardened pin.

The manual travel disengagement mechanisms also feature several variations. The classic ZP 01.631 latch featuring a small smooth ZP 01.629 button frequently slipped out of operators' hands in dusty environments, prompting field replacements with custom T-handles or wing nuts. Modern modifications replace clumsy buttons with a retaining ring that is easy to grip even while wearing thick work gloves. The cast-iron hubs have also evolved—while the classic right-side ZM 01.104 hub featured a characteristic cast boss along the keyway, newer versions are produced with a solid cylindrical outer profile and reinforced wall thicknesses.

The specialists at Zavod Moroza possess deep practical expertise in manufacturing and servicing running gear for grain throwers of all generations and modifications. We are thoroughly familiar with all structural nuances of these assemblies, including accommodating previous repairs or field alterations. Our in-house foundry and machining facilities allow us to produce strictly standardized components based on original blueprints to preserve the classic asymmetric drive as well as flexibly adapt parts or supply fully pre-assembled turnkey units tailored to your machinery's unique specifications.

Buying the ZP 01.220 Reverse Gear Assembly (With Wheels) from Zavod Moroza

Zavod Moroza's multi-year experience is founded on an ongoing, active dialogue and feedback loop with chief engineers and machine operators at agricultural enterprises. Observing grain throwers operating live on threshing floors and analyzing the outcomes of forced repairs, we have traversed the entire evolutionary path of this equipment—from early Soviet ZM-60 models to our contemporary ZM-60U, ZM-90U, and ZM-120U series. This practical insight drove us to develop our proprietary modernized running gear featuring a symmetric drive (dual cam clutches) and reinforced 500 mm wheels, ensuring effortless maneuvering and easing loads on the self-propelled gearbox during towing.

At the same time, we fully recognize that for many operations, the most rational choice remains preserving or rapidly restoring the classic asymmetric base. Purchasing the ZP 01.220 reverse gear in a complete assembly with wheels is the fastest and most dependable way to overhaul your ZM-60's running gear. You receive a fully calibrated factory-built unit featuring dialed-in cam clutch clearances, reliably installed 11206 bearings, and ready-to-mount ZPT 1.6.2 rubber-tired wheels that simply require securing to the frame and connecting to the drive chains.

Delivering the assembly fully built prevents complex workshop fitting adjustments and revitalizes your running gear with minimal downtime. Contact our sales department for professional consultation—we will help you accurately select components tailored specifically to your machinery and ensure prompt delivery so your grain thrower can resume flawless, uninterrupted operation!