ZM 07.105-01 (25x32x20) Cermet Side Gear Bushing

ZM 07.105-01 (25x32x20) Cermet Side Gear Bushing

The ZM 07.105-01 side gear bushing (listed as ZM 07.105-1 in some catalogs) is an anti-friction plain bearing bushing designed for installation inside the central bore of the ZM 07.605 (z=17) bevel side gear. It serves as a bearing support between the bevel gear and the hardened ZP 07.608 pin, ensuring free and smooth side gear rotation during differential mechanism operation. The design of a single differential assembly incorporates a set of two identical side gear bushings (one for each bevel side gear).

Technical Specifications of the ZM 07.105-01 Side Gear Bushing

• Catalog number - ZM 07.105-01 (ZM 07.105-1)
• Purpose - plain bearing for the ZM 07.605 (z=17, m=3.5) bevel side gear
• Dimensions (inner Ø x outer Ø x height): 25x32x20 mm
• Material - sintered anti-friction iron-graphite-based cermet
• Material properties - porous structure with a self-lubricating effect (absorbs oil from the oil bath and evenly releases it into the friction zone as load and temperature increase)
• Mating parts - ZP 07.608 side gear pin (Ø25 mm) and ZM 07.605 bevel gear (internal seating Ø32 mm)
• Quantity per assembly - 2 pcs.
• Country of manufacture - Ukraine

The application of a cermet alloy instead of conventional materials ensures a low friction coefficient, high wear resistance, and protects the surfaces of the steel pin and bevel gears from premature scoring or metal burning under heavy travel mechanism loads.

Assembly Evolution and Bushing Application

During the enhancement of grain thrower travel systems, the design of this assembly underwent certain changes that must be taken into account during repair operations:

• Older gearboxes of early ZM-60 models utilized classic shaped bronze bushings (ZP 07.003) featuring a distinct external flange (collar). This flange served as a thrust washer to absorb the side gear's axial end thrust and required specialized stepped pins of a matching configuration.
• Modern travel axles and gearboxes of our production utilize contemporary ZM 07.105-01 cermet bushings-smooth, straight-profile cylindrical bushings (25x32x20). The axial end pressure of the bevel mesh is distributed differently in this system, eliminating the need for a stepped pin, while separate steel adjustment (compensation) washers can be applied between the side gear and the cross spider housing when required.

Repair Compatibility Recommendations

The smooth ZM 07.105-01 cermet bushing is not a direct individual drop-in replacement for the older flanged bronze ZP 07.003 bushing without replacing associated components as a set. If you are restoring an old classic ZM-60 gearbox and intend to transition to modern cermet, the following configuration options must be considered:

1. When purchasing ZM 07.105-01 bushings, it is mandatory to order smooth hardened ZP 07.608 pins and a set of compensation washers to set the side gear end clearance.
2. If both the bushings, pins, and cross spider mounting seats are worn in the old differential, the ideal solution is to purchase the complete ZP 07.110.000 cross spider assembly-this provides a pre-adjusted factory unit equipped with new cermet bushings, pins, and modern-modification side gears already installed.

Signs of Wear and Differential Bushing Inspection

Timely replacement of side gear bushings prevents bevel gear misalignment and tooth destruction. The primary reasons for bushing replacement include:

• Increased radial play of the side gear on the pin (internal diameter wear exceeding limits).
• Appearance of cracks, chipping, or scoring on the cermet surface resulting from operation in contaminated oil or under dry friction.
• Uneven "elliptical" bore wear caused by constant unilateral pressure during rotation.

During bevel group repairs, bushings must be replaced strictly in pairs (2 pcs.), accompanied by mandatory inspection of the ZP 07.608 pin working journals.

Buying Grain Thrower Differential Bushings from Zavod Moroza

By ordering ZM 07.105-01 cermet bushings directly from Zavod Moroza, you receive original parts with precise dimensional compliance and superior anti-friction properties, which we utilize daily when assembling our proprietary agricultural machinery. Our specialists have thoroughly studied all the nuances of operating these sliding bearing assemblies under real field conditions, ensuring comprehensive expertise in every aspect of their selection, installation, and operation.

Unsure which specific bushings or pins are installed in your gearbox? Contact us through any convenient channel, and if possible, prepare photos or videos of the disassembled assembly. Zavod Moroza engineers will help precisely determine your differential modification and select the correct repair kit!