ZP 07.608 / ZM 07.608 Side Gear (Cross Spider) Pin

ZP 07.608 / ZM 07.608 Side Gear (Cross Spider) Pin

The ZP 07.608 side gear pin (listed as ZM 07.608 in some catalogs) is a heavily loaded cylindrical shaft for the ZM 07.605 bevel side gear (z=17), designed to ensure its reliable positioning and free rotation on the cross spider inside the differential housing. The component serves as a support element for the bevel group, absorbing direct radial loads from the side gear during torque distribution between the half-axles of the travel axle.

The design of a single differential assembly incorporates a set of two identical side gear pins, which are secured in the perpendicular holes of the cross spider or bevel gear block.

Technical Specifications of the ZP 07.608 Side Gear Pin

• Catalog number - ZP 07.608 (or ZM 07.608).
• Purpose - supporting rotation shaft for the ZM 07.605 bevel side gear (z=17) in bevel differential transmissions.
• Application - differential cross spider ZP 07.110.000 / ZP 07.609, gearless travel axles ZM120 06.100.000-05 (ZM-120U), two-speed gearboxes with differential ZP 07.100.000 (ZM-60U, ZM-90U), as well as classic self-propelled gearboxes ZP 07.000 (ZM-60).
• Material and processing - grade 45 structural steel with surface induction hardening (high-frequency currents) and precision grinding of working journals.
• Fixing method - transverse locking element (M6 screw or pin, depending on modification) to retain the pin against axial displacement and rotation within the cross spider body.
• Quantity per assembly - 2 pcs.
• Country of manufacture - Ukraine (Zavod Moroza).

The component is manufactured from turned steel bar stock followed by surface hardening and mirror grinding-this ensures high hardness of the working journal operating in contact with the anti-friction bushing (cermet or bronze), preventing premature wear or grooving (scoring) under friction.

Application Assemblies for the ZP 07.608 Side Gear Pin

Thanks to the standardized seating diameter for the ZM 07.605 side gear, the component is utilized across several drive mechanism configurations, including:

1. In the axle travel differential (ZM120 06.100.000-05) of the gearless ZM-120U
   In modern grain throwers featuring an independent gearmotor, two ZP 07.608 pins form an integral part of the assembled ZP 07.110.000 cross spider. They are inserted into the respective mounting holes of the cast iron ZP 07.609 cross spider housing and secured with M6x15 set screws. A ZM 07.605 side gear is installed on each pin via a ZM 07.105-01 (25x32x20) cermet bushing, operating within an oil bath inside the central axle drum.
2. In the two-speed travel gearbox with an integrated differential (ZP 07.100.000)
   In the compact self-propelled two-speed gearbox, where the differential is built directly into the gearbox housing between transmission gears, two ZP 07.608 pins similarly function as supporting shafts for two side gears. They are secured within the internal cross spider components, ensuring reliable bevel pair engagement under continuous oil lubrication.
3. In the self-propulsion mechanism (ZP 07.000 self-propelled gearbox) of classic grain throwers (ZM-60)
   In classic self-propelled gearboxes, ZM 07.608 pins served as side gear shafts within the internal differential block, operating in engagement via ZP 07.003 bronze bushings.

Design Evolution and Differences Between Modifications

Although the seating diameter for the ZM 07.605 side gear remained stable, the pins underwent specific geometric and structural modifications during the enhancement of travel systems:

• Displacement retention method
  In earlier gearbox versions, pins were secured with pins (or housing bores by certain manufacturers), whereas our more advanced ZP 07.110.000 cross spider utilizes a secure clamping fixation via M6 screws mating with a designated threaded bore on the pin body-completely eliminating axial play and pin ejection during drum rotation.
• Surface and geometry requirements
  The transition from classic bronze bushings (ZP 07.003) to modern sintered cermet bushings (ZM 07.105-01) introduced different demands regarding pin geometry, precision, and grinding. The factory pin from Zavod Moroza features a polished working journal with surface hardening and a corresponding shoulder, guaranteeing a minimal friction coefficient and extended service life for the sliding bearing assembly.

Associated Components and Inspection Recommendations

During differential assembly repairs or bevel gear replacement, inspecting the condition of the side gear pins is mandatory. The necessity to replace the ZP 07.608 pin arises upon detecting noticeable journal wear accompanied by a loss of cylindricity or ovality caused by constant radial loading. The component must also be replaced if scuffing, scoring, or metal overheating (burning) marks appear due to inadequate lubrication in the oil bath, or if the mounting flat and locking screw hole experience deformation or shearing.

Installing new side gears onto worn, loose pins causes tooth mesh misalignment, resulting in heightened noise and rapid tooth chipping. Consequently, the following parts are typically ordered alongside ZP 07.608 side gear pins:

• Bevel gears (side gears) ZM 07.605 (z=17) - 2 pcs.
• Anti-friction bushings (cermet ZM 07.105-01 or bronze ZP 07.003) - 2 pcs.
• Adjustment (compensation) washers ZP 07.401 / ZM 07.401 - mandatory replacement during repairs to compensate for wear, eliminate axial play, and restore proper bevel pair engagement.
• Cross spider housing ZP 07.609 (or complete cross spider assembly ZP 07.110.000, if the internal unit is entirely damaged and requires complete replacement alongside pre-installed pins and side gears).
• Differential housing (oil drum) or driven gear - structural foundation components to which the cross spider assembly is bolted via 4 holes.
• Fastening elements - M6x15 locking screws or hardened pins (depending on the assembly version and manufacturing year).

Buying the ZP 07.608 Side Gear Pin from Zavod Moroza

By ordering ZP 07.608 side gear pins directly from Zavod Moroza, you receive precision factory components featuring proper hardening and journal grinding, ensuring free side gear rotation without play or binding.

Need advice on cross spider configurations or differential inspection? Submit an inquiry on our website or give us a call regarding any questions you may have. Our engineers will help you select the correct set of spare parts for your grain thrower model and arrange prompt dispatch via Nova Poshta directly from our warehouse!