ZP 01.220 Reverse Gear Assembly with Wheels (Symmetric)

ZP 01.220 Reverse Gear Assembly with Wheels (Symmetric)

The ZP 01.220 symmetric reverse gear assembly with wheels is a fully integrated running axle designed for installation on ZM-60U and ZM-90U grain throwers, as well as for modernizing classic ZM-60 machines. The assembly secures to the lower frame using four H 026.058 cast-iron bearing housings and serves to receive torque from the self-propelled gearbox via drive chains, transferring it to both driving wheels.

The primary kinematic feature of this axle is its symmetric drive layout: two identical ZP 01.625 cam half-axles with dual disengagement mechanisms are installed on both sides. Unlike the obsolete asymmetric setup (where the right half-axle was blind), the symmetric drive allows operators to disengage both wheels from the transmission simultaneously. During transport or manual relocation, the wheels spin freely on cermet bushings without rotating the self-propelled gearbox elements, entirely eliminating parasitic load on the gear trains.

Supplying the reverse gear fully pre-assembled with two ZPT 1.6.2 rubber-tired wheels enables a complete running gear overhaul in a single step—saving workshop time otherwise spent pressing in cermet bushings, adjusting cam clutch clearances, and mounting tires.

Technical Specifications of the Symmetric ZP 01.220 Reverse Gear

• Assembly designation: ZP 01.220 Reverse Gear (Symmetric modification)
• Application: ZM-60U, ZM-90U, and as a modernization kit for ZM-60
• Drive layout: Symmetric (both half-axles are driven, equipped with individual travel disengagement mechanisms)
• Shaft bore diameter: 30 mm
• Shaft material: Structural carbon steel (Steel 35)
• Support assemblies: 4 cast-iron housings H 026.058 (Sch 20) featuring mounting feet for bolted frame attachment
• Bearing kit: Spherical double-row bearings 11206 (1207K + H207 with tapered adapter sleeves) — 4 pcs.
• Bearing chamber seals: Through cast-iron covers H 026.163 with clamped 30x52 mm oil seals (4 pcs.) and grease fittings
• Drive sprockets: ZP 01.340 (Z=25, pitch t=19.05 mm for PRL-19.05 roller chain) — 2 pcs. Mounted on a 30 mm smooth shaft surface secured with ZP 01.646 shear pins
• Wheel hubs: Cam-type cast-iron hubs ZM 01.180 — 2 pcs. Each hub contains two pressed-in cermet bushings NEN 400003 (30x40x20 mm)
• Drive disengagement mechanism: Cam half-clutches ZP 01.102 (2 pcs.), heavy-duty springs ZP 01.626 (2 pcs.), support washers ZM 01.435 (2 pcs.), and complete latch assemblies ZP 01.631 (2 pcs.)
• Complete wheel base: 2 rubber-tired wheels ZPT 1.6.2 (400 mm diameter, 100 mm width, 6 mm steel disk, pressed-on IZ 2162 tire) with M12 mounting bolts

The symmetric drive is built upon two mirrored ZP 01.625 half-axles. Longitudinal slots are milled onto each shaft to allow the ZP 01.102 cam half-clutch to slide smoothly. Under operational conditions, the ZP 01.626 heavy-duty spring keeps the clutch cams engaged with the ZM 01.180 hub slots. When the operator pulls both clutches outward until locked by the spring-loaded ZP 01.631 latches, both hubs enter free-wheeling mode on the NEN 400003 bushings, eliminating rotational drag and protecting the self-propelled gearbox during transport.

The entire weight of the grain thrower's rear section rests on four cast-iron H 026.058 housings. The internal spherical double-row 11206 bearings clamp tightly onto the smooth 30 mm shafts using H207 tapered sleeves. The spherical raceway of the outer bearing ring self-aligns within the housing, compensating for shaft deflection caused by machine weight or frame skew. Cast-iron H 026.163 covers fitted with 30x52 mm reinforced lip seals form a tight barrier that retains grease and blocks grain dust infiltration.

Both ZP 01.340 drive sprockets feature a smooth 30 mm inner bore and secure to the half-axles via ZP 01.646 shear pins. Fabricated from Steel 35 with precisely engineered shear thresholds, these pins shear first if foreign objects jam the wheels, instantly breaking the drive connection to protect chains and gearbox gears from destruction.

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

Left and Right Drive Half-Axle Assemblies (Mirrored Sets):

• Reverse shafts ZP 01.625 (30 mm diameter, Steel 35, featuring holes, keyways, and latch detent recesses) — 2 pcs.
• Drive sprockets ZP 01.340 (Z=25, 19.05 mm pitch, for PRL-19.05 roller chain) — 2 pcs.
• Safety shear pins ZP 01.646 and thrust retaining rings 6511 019 — 2 pcs. each
• Cam half-clutches ZP 01.102 featuring four cams and side lever bosses — 2 pcs.
• Heavy-duty springs ZP 01.626 and stamped support washers ZM 01.435 — 2 pcs. each
• Latch assemblies ZP 01.631 complete (guide bushings ZP 01.632, small springs ZP 01.628, release buttons ZP 01.629 or rings) — 2 sets
• Cam-type wheel hubs ZM 01.180 with 4-hole square flanges — 2 pcs.
• Cermet bushings NEN 400003 (30x40x20 mm dimensions), pressed into hubs — 4 pcs.
• Spacer ring kits 30 ZM 01.623 (complete with VM10 set screws and 50P spring rings) — 2 sets

Axle Support and Bearing Group:

• Cast-iron bearing housings H 026.058 (Sch 20) with mounting feet — 4 pcs.
• Spherical double-row bearings 11206 with H207 tapered clamping sleeves — 4 pcs.
• Cast-iron through-type bearing covers H 026.163 — 4 pcs.
• Reinforced rubber lip seals (30x52 mm oil seals) — 8 pcs.
• Grease zerks for replenishing lubricant within bearing chambers — 4 pcs.

Wheel Unit:

• Rubber-tired wheels ZPT 1.6.2 (400 mm diameter, 6 mm steel disk, pressed-on bandless IZ 2162 tire) — 2 pcs.
• M12 mounting bolts with nuts and washers for securing wheels to hub flanges — 8 sets.

The classic ZM-60 reverse gear featured a blind right half-axle ZP 01.627 and a fixed ZM 01.104 hub—a layout that generated persistent resistance when moving the grain thrower because the right wheel was forced to spin internal gearbox components. Transitioning to the symmetric design utilizing two ZP 01.625 cam half-axles eliminates this drawback, making towing effortless and safe for the transmission.

Manufacturing practices for reverse gear parts across various producers and generations have experienced design updates. For instance, keyways for the ZP 01.102 clutch are machined extended to smooth out longitudinal travel during disengagement. Additionally, instead of the classic ZP 01.629 release button, which tended to slip out of greasy hands, modern axles utilize a convenient metal ring that is easy to catch even while wearing thick work gloves.

The factory ZM 01.180 hub flange is universal: classic series mount 400 mm ZPT 1.6.2 rubber-tired wheels, whereas modernized ZM-60U and ZM-90U units built in-house accept reinforced 500 mm wheels sourced from OVS-25 grain cleaners on the same hubs, increasing ground clearance and operational convenience.

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 as well as flexibly adapt parts or supply fully pre-assembled turnkey units tailored to your machinery's unique specifications.

Buying the Symmetric ZP 01.220 Reverse Gear Assembly (With Wheels)

Zavod Moroza's multi-year experience is founded on an ongoing, practical dialogue with agricultural engineers and machine operators. Observing grain throwers operating live on threshing floors, we have walked the entire evolutionary path of this equipment side-by-side—from the earliest Soviet-era ZM-60 models to current ZM-60U, ZM-90U, and ZM-120U series.

Purchasing the symmetric ZP 01.220 reverse gear in a complete factory assembly with wheels is the fastest way to restore or upgrade your grain thrower's running gear. You receive calibrated axle modules featuring precisely tuned ZP 01.102 cam clutch travel, pressed-in NEN 400003 bushings, installed 11206 bearings, and secured ZPT 1.6.2 wheels.

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 to keep your grain thrower running efficiently without operational delays!