ZP 01.220 Reverse Gear Assembly (Symmetric, Without Wheels)

ZP 01.220 Reverse Gear Assembly (Symmetric, Without Wheels)

The symmetric rear wheel block without the wheel set is a fully integrated running gear mechanical assembly (ZP 01.220 reverse gear), designed for installation on ZM-60U and ZM-90U grain thrower series, as well as for upgrading legacy ZM-60 grain throwers to a modern dual-clutch layout. The assembly mounts to the lower frame using four cast-iron footed H 026.058 housings and receives torque from the self-propelled gearbox via chain drives, routing it to two wheel hubs.

The main kinematic advantage of this build lies in the use of two mirrored ZP 01.625 half-axles, each equipped with an individual ZP 01.102 cam half-clutch. Unlike the single-clutch asymmetric base of early ZM-60 models, the symmetric design allows the operator to disengage the drive of both wheels simultaneously. During towing or manual relocation of the machine, both ZM 01.180 hubs roll freely on cermet bushings without driving the gearbox elements, eliminating parasitic drag and fully unloading the transmission.

A notable feature of this supply configuration is the exclusion of the two ZPT 1.6.2 rubber-tired wheels and M12 wheel bolts. However, the assembly ships complete with two ZM 01.180 cam hubs featuring standardized square 4-hole mounting flanges. This configuration option is an economically sound solution for agricultural operations where existing wheel disks and tires remain serviceable, or when installing upgraded 500 mm OVS-25 cleaner wheels or pneumatic tires is planned. Ordering the assembled running axle without wheels enables a complete axle overhaul without overpaying for tires and without wasting workshop time on the mechanical assembly of bearing and clutch units.

Technical Specifications of the Symmetric ZP 01.220 Reverse Gear (Without Wheels)

• Assembly designation: ZP 01.220 Reverse Gear (Symmetric configuration without wheels)
• Machine compatibility: ZM-60U, ZM-90U, and modernization kits for ZM-60
• Drive layout: Symmetric dual-clutch (both sides feature independent travel disengagement mechanisms)
• Shaft bore diameter: 30 mm
• Half-axle material: Structural carbon steel (Steel 35)
• Support assemblies: 4 cast-iron housings H 026.058 (Sch 20) with mounting feet for bolted frame attachment
• Bearing kit: Spherical double-row bearings 11206 (1207K + H207 tapered adapter sleeve set) — 4 pcs.
• Bearing chamber protection: Through cast-iron covers H 026.163 with clamped reinforced lip seals (30x52 mm oil seals) — 4 pcs., 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 safety shear pins
• Wheel hubs: Cast-iron cam hubs ZM 01.180 featuring open square 4-hole flanges — 2 pcs. Each hub contains two pressed-in cermet bushings NEN 400003 (30x40x20 mm)
• Drive control mechanisms: 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 spring-loaded latch assemblies ZP 01.631 (2 pcs.)
• Wheel set inclusion: Excluded (supplied without wheels and bolts)

The symmetric axle is built upon two mirrored ZP 01.625 half-axles—slots are milled along the working sections of each shaft to allow the ZP 01.102 cam half-clutch to slide. In the operating position, the ZP 01.626 heavy-duty spring holds the clutch cams engaged with the ZM 01.180 hub, while pulling the clutches outward until locked by the spring-loaded ZP 01.631 pins transitions both hubs into free-rolling mode on the NEN 400003 cermet bushings. This eliminates parasitic rotation of the internal self-propelled gearbox gears, making machine maneuvering on the threshing floor effortless.

Loads generated by frame weight and grain material distribute across four H 026.058 cast-iron housings. The internal spherical double-row 11206 bearings clamp tightly onto the smooth 30 mm shafts via H207 tapered sleeves, while the spherical raceway of their outer ring self-aligns inside the housings, compensating for shaft deflection and mounting deviations in the frame's geometric plane. To prevent lubricant leakage and protect raceways from grain dust, each housing is sealed with an H 026.163 through cast-iron cover fitted with 30x52 mm reinforced lip seals.

Both ZP 01.340 drive sprockets mount onto the smooth half-axle surfaces and secure via ZP 01.646 shear pins engineered with a calculated shear strength threshold. In the event of foreign objects jamming the wheels or running gear locks, the pin shears first, instantly breaking the power transmission and protecting chains and gearbox gears from further wear and destruction.

Full Contents of the Symmetric ZP 01.220 Reverse Gear Kit (Without Wheels)

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

• Reverse shafts ZP 01.625 (30 mm diameter, Steel 35, featuring cotter pin 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 with side lever bosses — 2 pcs.
• Heavy-duty compression 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, return springs ZP 01.628, release buttons ZP 01.629 or rings) — 2 sets
• Cam-type wheel hubs ZM 01.180 with open 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) on mounting feet — 4 pcs.
• Spherical double-row bearings 11206 with H207 tapered clamping sleeves — 4 pcs.
• Through cast-iron bearing covers H 026.163 — 4 pcs.
• Rubber reinforced lip seals (30x52 mm oil seals) — 8 pcs.
• Grease zerks for replenishing lubricant within bearing chambers — 4 pcs.

The factory layout of classic ZM-60 grain throwers utilized a blind right ZP 01.627 half-axle and ZM 01.104 hub designed for single-speed gearboxes with internal differentials. During towing, the right wheel was forced to continuously spin internal gears and differential satellites through its unbroken connection, creating extra resistance and premature gear wear. Subsequent ZM-60A models introduced a two-speed gearbox without a differential, requiring two symmetric half-axles equipped with disengagement mechanisms. On modern ZM-60U and ZM-90U series, a symmetric drive utilizing two ZP 01.625 half-axles and clutches is the standard configuration, fully relieving transmission loads during transport despite utilizing a modern differential-equipped gearbox—a practical and logical step that makes relocating the machine across the threshing floor effortless while further safeguarding the transmission against wear.

Manufacturing practices for reverse gear elements have evolved over time. Keyways for sliding the ZP 01.102 clutch on shafts are machined longer for smoother longitudinal travel, while classic ZM 01.629 latch buttons that tended to slip out of greasy hands have been replaced in modern builds with metal rings that are comfortable to pull even while wearing thick work gloves. The ZM 01.180 hub flange features standardized bolt spacing, allowing this running axle to accommodate classic 400 mm ZPT 1.6.2 wheels alongside reinforced 500 mm wheels or pneumatic tire disks.

The specialists at Zavod Moroza possess deep practical expertise in manufacturing and servicing running gear for grain throwers across all generations and modifications. We are thoroughly familiar with all structural nuances of these assemblies, including the outcomes of typical repairs or field conversions. 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 exact requirements.

Buying the Symmetric ZP 01.220 Reverse Gear Assembly (Without Wheels)

Zavod Moroza's multi-year experience is founded on ongoing, practical dialogue with agricultural enterprises. Observing grain throwers operating under diverse conditions, we have navigated every evolutionary stage of this machinery—from classic ZM-60s to modern ZM-60U, ZM-90U, and ZM-120U series.

Purchasing the symmetric ZP 01.220 reverse gear assembly without wheels is a cost-effective way to overhaul or upgrade the mechanical components of your grain thrower's rear axle without unnecessary overspending. You receive a factory-calibrated unit complete with pre-fitted half-axles, installed 11206 bearings, oil seals, adjusted ZP 01.102 clutches, and seated NEN 400003 bushings—commissioning requires simply securing the H 026.058 housings to the frame, bolting existing wheels to the hub flanges, and tensioning the drive chains.

Supplying the assembled unit eliminates the need for complex workshop fitting or alignment work. Contact our sales department for professional consultation—we will help select the exact configuration matching your machinery's parameters and organize prompt shipment to ensure the stable and efficient operation of your grain thrower.