ZP 01.625 Reverse Gear Shaft

ZP 01.625 Reverse Gear Shaft for Grain Thrower

The ZP 01.625 shaft is a heavy-duty running gear component that plays a critical role in the kinematic scheme of the self-propelling mechanism of grain throwers (ZM-60, ZM-90, ZM-120, and their modifications). It serves as the rear drive half-axle and is responsible for directly transmitting torque from the self-propelled gearbox via a chain drive directly to the machine's driving wheel.

The main engineering feature of this shaft lies in its structural combination with the wheel drive disconnection mechanism (the ZP 01.102 jaw half-clutch). The 30 mm diameter shaft is manufactured from durable structural carbon steel (Steel 35) and features precise machining of seating surfaces, keyways, and specialized grooves. It houses 11206 spherical bearings within H 026.058 cast-iron housings, a drive sprocket, and a movable jaw clutch with a locking pin, enabling the operator to easily disengage the kinematic connection between the wheel and transmission for safe towing or manual relocation of the unit.

Technical Specifications of the ZP 01.625 Shaft

• Catalog number: ZP 01.625
• Application: ZM-60, ZM-60A, ZM-60U, ZM-90U
• Installation assembly: Rear drive ZP 01.220 (driving wheel drive and disconnection mechanism)
• Purpose: Driving half-axle for transmitting torque from the self-propelled gearbox to the wheel with the capability for prompt transmission disengagement
• Bore diameter: 30 mm
• Material: Structural carbon steel (Steel 35)
• Weight: 5.0 kg
• Compatible bearings: 11206 (1207K + H207) — 2 pcs. per shaft

Structurally, the ZP 01.625 shaft is an elongated solid steel rod 30 mm in diameter with high-precision machining applied to its working surfaces. Unlike standard solid axles, this shaft features an array of specially bored and milled elements, each fulfilling a specific function within the reverse gear kinematics:

1. Keyways
Keyways for prismatic keys (measuring 8x7 mm) are milled into the working end of the shaft. These are required for the operation of the movable ZP 01.102 half-clutch—the key transmits rotational torque from the shaft to the clutch while allowing the clutch to slide freely lengthwise along the axis when the operator manually disengages the drive.

2. Spherical Lock Pocket (Indent)
Positioned next to the keyway is a specialized spherical indent—this is where the spring-loaded pin of the ZP 01.631 locking assembly seats when the operator pulls the half-clutch outward. The lock clicks into this pocket, securely holding the clutch in the open (idle) position and preventing it from spontaneously re-engaging with the wheel during towing.

3. Radial Holes for Cotter Pins and Shear Pins
Several radial holes are machined into the shaft, each responsible for securing components of the reverse gear mechanism. Specifically, the through-holes in the jaw clutch zone accommodate 6.3x40 mm assembly cotter pins—these retain the ZM 01.435 thrust washer and serve as an end stop for the compressed ZP 01.626 power spring, preventing the entire disconnection assembly from shifting off the half-axle. Additionally, the shaft features a hole for a specialized ZP 01.646 safety shear pin, which positions the ZP 01.340 drive sprocket on the half-axle. This pin serves a protective role in the transmission by shearing first during critical overloads or wheel jamming, protecting the self-propelled gearbox from destruction.

4. Annular Grooves for Retaining Snap Rings
Special grooves (undercuts) for 6511 019 spring retaining rings are machined onto the shaft. These grooves are intended for the axial positioning of adjacent components (such as the drive sprocket), preventing unintended longitudinal displacement along the shaft axis while the running gear operates under constant vibrations and alternating loads.

In actual field practice and depending on the manufacturing year or factory modification of the grain thrower, the ZP 01.625 shaft may exhibit structural variations from classic catalog drawings. For instance, official documentation specifies a short keyway, whereas in practice it is often extended to provide sufficient longitudinal travel for the ZP 01.102 half-clutch during drive disengagement. Furthermore, the spherical lock pocket may be absent (if non-standard clutches are used on the farm), and the snap ring groove or pin holes may feature different diameters, placements, or be omitted entirely. The specialists at Zavod Moroza thoroughly understand these engineering nuances, series-specific variations, and the consequences of prior field repairs. Leveraging our in-house metalworking production, we manufacture both strictly standardized parts and custom-adapt or fabricate the ZP 01.625 shaft to match any unique parameters of your machine—featuring custom keyway lengths, hole locations, or specific fits.

Associated Parts of the ZP 01.625 Shaft

Because the ZP 01.625 shaft acts as the central axis for the ZP 01.220 reverse disconnection mechanism, it operates in direct interaction with a complete set of power, support, and control elements. During replacement or running gear overhauls, the following adjacent components must be inspected:

• Jaw half-clutch ZP 01.102
• Wheel hub ZM 01.180
• Locking assembly ZP 01.631 complete
• Power spring ZP 01.626 and thrust washer ZM 01.435
• Support bearing assemblies (bearing 11206 + housing and cover)
• Drive sprocket ZP 01.340
• Running wheel ZPT 1.6.2 or SMM 01.090 (depending on modification)

The operation of the ZP 01.625 shaft is closely linked to the ZP 01.102 jaw half-clutch and the ZM 01.180 hub, which on classic ZM-60 models were installed as a single kit (asymmetric drive), whereas on modern ZM-60U and ZM-90U units they are installed on both sides for symmetrical transmission protection. To hold the clutch in the idle state during towing, the ZP 01.631 locking assembly is utilized, with its pin dropping directly into the shaft pocket. Additionally, the hub flange on this shaft permits the mounting of both classic 400 mm rubber-coated ZPT 1.6.2 wheels and reinforced 500 mm wheels for enhanced mobility.

Buying the ZP 01.625 Shaft Directly from the Manufacturer

Extended operation of agricultural machinery frequently leads to the wear of adjacent elements or forced alterations in factory kinematics. The specialists at Zavod Moroza fully understand these practical realities—thanks to our in-house foundry and metalworking facilities, we manufacture precisely standardized parts as well as custom-adapt them to individual parameters or supply fully assembled turnkey units. Contact our sales department for professional consultation to select reliable direct-from-manufacturer components and ensure the uninterrupted operation of your machinery!