Counter Shaft Bearing 8-97253107-0 / 8972531070 For ISUZU MYY5T MYY6S 4HG1 4HE1 — 30207 Tapered Roller, 35×72×18.25 Mm, OEM-Spec

This bearing serves as the front and rear counter shaft (intermediate shaft) bearing — the 30207 tapered roller bearing that supports the counter shaft / layshaft within the gearbox, maintaining precise shaft alignment and smooth rotation under torque load. It is referenced in multiple technical and interchange catalogs as the 30207 bearing, with boundary dimensions of 35 mm bore * 72 mm outside diameter * 18.25 mm width and a reference weight of 0.224 kg per piece.

This is a single-row tapered roller bearing (30207 series), designed to accommodate combined radial and axial loads on the counter shaft. It is not a deep-groove ball bearing or a needle roller bearing. Substituting a different bearing type will alter load capacity and shaft alignment.

The bearing is confirmed for MYY5T (5-speed) and MYY6S (6-speed) manual transmissions used in the NQR71 / NPR / NLR85 / NQR75 / NPR75 / NMR85 / NQR90 platforms. Confirm the gearbox code before ordering — other ISUZU transmissions (MZZ6, MSB-5S, etc.) use different bearing configurations.

Reference data describes this bearing as the front and rear counter shaft bearing ("передний, задний подшипник вала" / front and rear shaft bearing). It supports the counter shaft at both ends in some applications. Confirm the required position and quantity — some rebuilds require one bearing per shaft end.

• ✓OE Reference & Bearing Number Verified: 8-97253107-0 / 8972531070 / 8-97253-107-0 is consistently identified as the 30207 tapered roller bearing for the ISUZU MYY5T/MYY6S counter shaft application.
• ✓Boundary Dimensions Verified: 35 mm (bore) * 72 mm (outside diameter) * 18.25 mm (T) — confirmed across multiple bearing technical listings.
• ✓Weight Verified: 0.224 kg/pcs — confirmed by two independent bearing supplier specifications.
• ✓Load Ratings Verified: Dynamic load rating (C): 41.4 kN; Static load rating (Co): 52.5 kN — confirmed by the 30207 bearing technical data sheet.
• ✓Speed Ratings Verified: Grease: 6,100 rpm; Oil: 8,100 rpm — confirmed by the 30207 specification table.
• ✓Gearbox & Engine Coverage Verified: MYY5T / 4HG1 / 4HE1 / 4HF1 / MZZ6U — confirmed by multiple factory-direct and interchange listings.
• ✓Vehicle Coverage Verified: NQR71, NPR, NLR85, NQR75, NPR75, NMR85, NQR90 — confirmed across Russian, Spanish, and interchange catalogs.
• ✓Cross-Reference Density Verified: BPW 02 6401 35 00 / 264013500; NEW HOLLAND 87282046; VALTRA LA5011; ZF 0750 117 442 / 750117442; TIMKEN SET 1016 — confirmed as cross-referenced bearings for the 30207 / 8-97253-107-0 application.
• ✓Interchange Reference Verified: ISO T3DB035 — confirmed as an ISO dimensional interchange for the 30207 bearing.
• ✓Brand Cross-Reference Verified: QRL HR 30207J; NSK HR30207J; NACHI 30207J — confirmed as bearing-brand equivalents for the 30207 / 8972531070 application.
• ⚠Material Specification NOT Explicitly Published: Public bearing data for the 30207 identifies the type as tapered roller but does not explicitly state the steel grade (e.g., GCr15 / 100Cr6). Confirm material certification at inquiry if a specific bearing steel grade is required. One parts listing describes the broader assembly material as "Metal, rubber" — this is not a bearing steel specification.

• Transmission whine or growl that changes with speed: A worn counter shaft bearing produces a continuous humming, whining, or growling noise that varies with vehicle speed and may change pitch under acceleration or deceleration.
• Rumbling or grinding noise at idle in neutral: The counter shaft continues to rotate with the engine even in neutral; a worn bearing produces noise when the vehicle is stationary.
• Vibration through the gear lever or floor: Bearing degradation allows the counter shaft to deflect or oscillate, transmitting vibration through the gearbox and into the cabin.
• Difficulty engaging or disengaging gears: Bearing wear can cause shaft misalignment, leading to poor gear mesh and hard shifting.
• Metal particles or glitter in the transmission fluid: Advanced bearing wear produces metallic debris that circulates in the gear oil — a sign of imminent failure.
• Oil leak at the counter shaft bearing retainer: A failed bearing seal or excessive shaft play can allow transmission fluid to escape at the bearing retainer area.

• Gearbox code is the first check: This bearing is confirmed for MYY5T and MYY6S gearboxes. Other ISUZU manual transmissions (MZZ6, MSB-5S, etc.) use different bearing configurations. Confirm the gearbox code before ordering.
• Bearing number 30207 is the second check: This is a tapered roller bearing with 35 mm bore / 72 mm OD / 18.25 mm width. A different bearing number (e.g., 30206, 30208) will not fit the shaft or housing bore correctly.
• Position and quantity: Reference data describes this as the front and rear counter shaft bearing. Some gearbox rebuilds require one bearing per shaft end. Confirm the required quantity against the workshop manual or original bearing count.
• Engine coverage: Core engine applications are 4HG1, 4HE1, and 4HF1. Provide the VIN for final confirmation in mixed-fleet applications.

1. Confirm the required part first: Verify the original bearing's bore, OD, and width (35 * 72 * 18.25 mm) and the bearing number (30207). Confirm the gearbox code (MYY5T / MYY6S) and the front/rear position and quantity required.
2. Remove the gearbox: Support the gearbox with a transmission jack and separate it from the engine. Drain the transmission fluid.
3. Disassemble the gearbox: Remove the extension housing, center plate, and counter shaft as required to access the bearing. Note the orientation and any shims, snap rings, or spacers.
4. Remove the old bearing: Use a bearing puller or press to extract the bearing from the shaft or housing. Do not hammer on the bearing or shaft — this can damage the raceway or shaft surface.
5. Clean and inspect: Clean the bearing bore and shaft surface. Inspect for wear, scoring, or discoloration. A damaged shaft or housing bore will cause premature bearing failure.
6. Install the new bearing: Press or drive the new 30207 bearing into position using the appropriate driver on the bearing race (not the rollers or cage). Do not apply force through the rolling elements.
7. Set bearing preload/end-play: Follow the workshop manual procedure for setting counter shaft bearing preload or end-play. Incorrect preload causes rapid bearing failure.
8. Reassemble and refill: Reinstall the counter shaft, center plate, and extension housing. Refill with the specified transmission fluid. Road-test the vehicle, listening for abnormal noise and checking for smooth gear engagement.

• Change transmission fluid according to the ISUZU schedule (typically every 40,000–60,000 km). Degraded fluid accelerates bearing wear.
• Monitor for transmission noise at every service — early detection of bearing whine prevents gearbox damage.
• Avoid aggressive shifting and overloading — shock loads accelerate bearing fatigue.
• Inspect counter shaft end play during any gearbox overhaul — excessive play indicates bearing wear.

• Standard packing: Carton / woven bag; neutral or customer-branded packaging available.
• Package contents: 1 * Counter Shaft Bearing (30207). Snap rings, shims, and transmission fluid are not included unless explicitly stated — confirm at inquiry.
• Set options: Single bearing (standard) / bearing + snap ring/shim kit (where available) — specify at inquiry.
• Suitable for: ISUZU MYY5T / MYY6S transmission repair shops, NQR71 / NPR / NLR85 / NMR85 commercial truck fleet maintenance departments, gearbox rebuilders, spare parts distributors, and export wholesalers.