MAG-170VP 114-1626 Travel Motor Assembly for Caterpillar 320B Excavator

Reliable crawler track propulsion on the 20-ton Caterpillar 320B excavator requires high-output tractive effort to power through muddy construction trenches, demolition slabs, and trailer ramps. Tatan Machinery supplies 100% Brand New GM35VA complete final drive travel motor assemblies (OEM part numbers: 107-7032 / 145-6364, backward compatible with 114-1237 / 107-7033). Combining an automatic two-speed axial piston hydraulic motor with an enclosed multi-stage planetary reduction gearbox, each unit is equipped with heavy-duty duo-cone mechanical floating seals and an internal wet-disc parking brake pack. Backed by our 12-Month Comprehensive Replacement Warranty.

First-Party Stockholder & Wholesaler Verification

Tatan Machinery is a verified first-party physical stocking wholesaler of heavy excavator hydraulic components. We do not dropship unverified goods. All hydraulic pumps, main valves, and travel drives supplied on our site are 100% Brand New (our diesel engine assemblies are remanufactured to OEM tolerances).

Field Diagnostics: Root Causes of CAT 320B Final Drive Failure

Operating a 20-ton excavator in deep mud, backfilling foundations, and climbing trailer ramps places immense torque strain on track drives. When tracking fails, field repairs usually result in repeated breakdowns:

• Center Swivel Seal Failure Blowing Motor Shaft Seal: When the central swivel joint seals degrade, high hydraulic tank backpressure backs up into the travel motor case-drain line. Pressure exceeding 0.3 MPa blows out the motor main shaft seal, forcing high-pressure hydraulic oil directly into the planetary gearbox and blowing oil out through the sprocket seals.
• Mechanical Floating Seal Wire Ingress & Oil Starvation: Construction wire, roots, or abrasive mud packing into the sprocket recess chew through the rubber O-rings supporting the duo-cone floating seals. Once the 5.0L gear oil volume drains unnoticed, planet gears weld together in less than 100 meters of tracking.
• Track Tension Over-Tightening & Main Hub Bearing Fatigue: Machine operators frequently over-grease track adjusters. Excessive track chain tension puts enormous radial side-loading on the final drive hub, crushing the heavy tapered roller bearings and tilting the planetary carrier.
• Motor Barrel Slippage & Single-Track Pulling: Scoring across the motor valve plate dumping high-pressure fluid into the case-drain line. The excavator continuously veers toward the weak track side when travel levers are pushed full forward.

Factory Dyno Testing & 12-Month Component Warranty

To guarantee immediate reliability on your worksite, every 107-7032 final drive is tested on our automated hydraulic test bench under full working parameters before export approval:

1. Planetary Gear Mesh & Backlash Check: Precise dial measurement of tooth clearance across 1st and 2nd stage planetary gear clusters to eliminate gear whine and premature tooth pitting.
2. Two-Speed Shift Hydraulic Pressure Verification: Actuating the dual-displacement motor swashplate from high-speed (small angle) to high-torque (large angle) to guarantee instant downshift response under full relief pressure.
3. Counterbalance Valve Anti-Runaway Hold Test: Testing the dynamic brake valve spool to ensure the track will not over-speed or free-wheel when tracking downhill.
4. Duo-Cone Floating Seal Air Decay Test: 1.5 bar pneumatic air hold test on the planetary hub cavity to certify 100% seal integrity before gear oil filling.
5. Track Frame Pilot & Sprocket PCD Accuracy Check: CMM coordinate check on track frame mounting bolt patterns and sprocket bolt holes to guarantee 100% bolt-on alignment.

Export Heavy-Duty Packaging Protocol

A heavy 225 kg final drive requires reinforced industrial packaging to survive ocean transit without shift or moisture penetration:

• Threaded Metal Port Plugs: Main travel ports, case drain line, and 2-speed shift signal ports sealed with heavy-duty metal blanking caps.
• Marine Anti-Rust Wax: External bare hub surfaces, sprocket mounting faces, and bolt threads coated with heavy marine anti-rust wax.
• Solid Structural Base Mounting: The drive unit is bolted down upright to high-density solid wood base skids to prevent tipping during transit.
• ISPM 15 Fumigation-Free Solid Plywood Box: Fully enclosed export crate banded with multiple high-tensile galvanized steel straps.

Sealed steel port caps, protective anti-corrosion wax, and reinforced wooden crating

Supported Global Logistics & Customs Documentation

Prompt logistics dispatch adapted for urgent machine-down emergencies and trade stock:

• Air Express (3–7 Days Door-to-Door): Handled via DHL Express, FedEx, or air cargo for rapid jobsite recovery.
• Sea Freight Consolidation: Economical LCL shipping for distributors stocking multiple units.
• Tariff-Ready Paperwork: Commercial invoice detailing official HS Code (8483.40 / 8412.29), packing lists, and Certificate of Origin (COO) upon request.

Daily overseas air express dispatches and consolidated container freight

Field Commissioning Rules: Protect Your New Final Drive

Planetary gears and travel motors operate under extreme torque. You MUST perform these steps during assembly:

1. MANDATORY: Fill Planetary Gearbox Oil Before Tracking: Final drives are shipped dry or with minimal testing lubricant. Rotate the hub until one plug is at 12 o’clock (fill) and one is at 3 o’clock (level). Fill with clean SAE 80W-90 or 85W-140 gear oil (~5.0L) until oil weeps from the level plug! Tracking with dry gears will destroy the planetary train in 50 meters!
2. Pre-Fill Motor Casing with Clean Hydraulic Oil: Disconnect the case-drain line and pour clean hydraulic oil into the motor housing before connecting the hose. Dry-starting the hydraulic motor will instantly burn out the slipper shoes.
3. Sprocket Bolt Torque & Threadlocker: Clean the track drive sprocket mating face. Apply Loctite 271 high-strength threadlocker to all sprocket bolts and torque strictly to Cat factory torque specs in a criss-cross pattern.
4. Verify Case-Drain Line Pressure: Ensure the case-drain line back to the swivel joint and hydraulic tank is completely unobstructed. Any backpressure over 0.3 MPa will blow out the motor main shaft seal into the planetary gearbox!
5. Low-Speed Track Air Bleeding: Elevate the track using the boom. Run the track in forward and reverse at low idle for 5 minutes without load to purge all trapped air from the hydraulic lines.

Procurement Decision FAQ: What Buyers Ask

🔗 Frequently Purchased Together with CAT 320B Final Drive:

• DIESEL ENGINE:
  Caterpillar 320B 3066T Diesel Engine Assembly (125-2988)
  Remanufactured
• MAIN VALVE:
  Main Control Valve Assembly (126-2068) for Caterpillar 320B
  100% Brand New
• HYDRAULIC PUMP:
  SBS80 / AP-12 Hydraulic Main Pump (114-0491) for Caterpillar 320B
  100% Brand New
• SWING MOTOR:
  M2X150 Swing Motor Assembly (114-1234) for Caterpillar 320B
  100% Brand New
• BRAND CATALOG:
  View All Caterpillar Excavator & Heavy Equipment Parts Collection

Get Wholesale Factory Quote for CAT 320B Final Drive 107-7032

Looking for direct factory pricing, stock availability, or 12-month warranty terms for Cat 320B travel drives? Contact senior specialist Gavin now!

💡 Fast Quote: Send your machine serial number or current travel motor photos for an accurate match within 10 minutes!