Caterpillar 336E Final Drive Travel Motor Assembly (OEM 507-9338 / 507-9339)

Tatan Machinery supplies 100% Brand New complete final drive travel motor assemblies (OEM part numbers: 507-9338 / 507-9339, matching gearbox 501-7238 and travel motor 322-8729 / 591-8316) for Caterpillar 336E and 336E L heavy crawler excavators. Delivering high-torque tractive effort for mass quarrying and earthmoving, this drop-in track drive assembly combines a two-speed variable axial piston motor with a multi-stage heavy planetary reduction gearbox. Supported by our 12-Month Comprehensive Replacement Warranty, each assembly is completely bench-tested for gear tooth contact, hydraulic two-speed shift response, and duo-cone mechanical floating seal oil containment.

Supplier Information & Build Status

When to Replace the Final Drive on CAT 336E: Diagnostic Criteria

The CAT 336E weighs over 36 metric tons; track drives absorb intense shock loads during quarry travel and slope climbing. When catastrophic mechanical wear strikes, replace the complete assembly under these severe symptoms:

• Complete Track Drive Lockup or Severe Pulling to One Side: One track fails to rotate or drags heavily under load. Internal planetary sun gears or planet pinion needle bearings have disintegrated, locking the drive hub solid.
• Floating Face Seal Failure & Catastrophic Oil Drain: Duo-cone mechanical floating face seals cut by wire or packing mud. Once planetary gear oil drains, high-speed planetary gears run dry and weld together in minutes.
• Two-Speed Shift Failure (Rabbit / Turtle Mode Jammed): The excavator cannot switch travel speeds or lacks tractive power on inclines. The internal travel motor swashplate shift piston is scored or the counterbalance spool is stuck.
• Hydraulic Case-Drain Pressure Blowout: High-pressure oil bypassing worn piston slippers blowing past the shaft seal into the planetary gearbox, forcing gear oil out through the main track frame seals.

Workshop Bench Testing & 12-Month Warranty Guarantee

Every 100% Brand New CAT 336E travel drive supplied by Tatan Machinery comes backed by a 12-Month Comprehensive Replacement Warranty. Before export packaging, our technicians complete a 5-point quality validation:

1. Planetary Gear Backlash & Tooth Engagement 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.
3. Counterbalance Valve Anti-Cavitation Test: Dynamic testing of the brake valve spool to verify smooth braking when traveling downhill without over-speed runaway.
4. Dual Floating Face 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. Flange Pilot Diameter & Sprocket Bolt Hole Runout: CMM coordinate check on track frame mounting pilots and sprocket bolt circles to guarantee 100% bolt-on alignment.

Export Heavy-Duty Packaging Process

A heavy 345 kg final drive requires reinforced industrial packaging to survive ocean transit without shift or moisture penetration:

• 100% Sealed Metal Port Caps: Main travel feed ports, case drain line, and 2-speed pilot shift ports sealed with heavy-duty metal blanking caps.
• Anti-Corrosion Wax Coating: External bare hub surfaces, sprocket mounting faces, and bolt threads coated with heavy marine anti-rust wax.
• Custom Internal Structural Timber Cradle: The drive unit is bolted down upright to high-density solid wood base skids to prevent tipping.
• ISPM 15 Fumigation-Free Solid Plywood Box: Fully enclosed export crate banded with multiple high-tensile galvanized steel straps.

Actual sealed port caps and heavy-duty crating for 336E final drive assembly

Global Shipping & Customs Documentation

Direct international dispatch tailored for commercial contractors and parts distributors:

• Emergency Machine Down Air Cargo: Fast air express via DHL Aviation, FedEx Freight, or international airlines within 3–7 business days.
• Consolidated Ocean Sea Freight (LCL / FCL): Direct containerized shipping to worldwide commercial ports.
• Clean Customs Clearance Paperwork: Commercial Invoices with correct HS Code (8483.40 – Gears & Reduction Units / 8412.29 – Hydraulic Motors), Packing Lists, and Certificates of Origin for tariff optimization.

Container loading and air freight dispatch supported by global logistics partners

Critical Installation Guidelines (CAT 336E Final Drive Technician Checklist)

To prevent instant failure and protect your 12-month warranty, technicians MUST adhere to these critical procedures:

1. MANDATORY: Pre-Fill Planetary Gearbox Oil Before Operation: Travel motors are shipped dry or with test oil. Rotate the drive hub until one plug is at the 12 o’clock position (fill) and one is at the 3 o’clock position (level). Fill with clean SAE 80W-90 or 85W-140 gear oil until oil weeps from the level plug! Starting with dry gears will destroy the planetary train in 50 meters!
2. Pre-Fill Motor Casing with 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.

Buyer Frequently Asked Questions (Purchasing FAQ)

🔗 Frequently Purchased Together with CAT 336E Final Drive:

• DIESEL ENGINE:
  Caterpillar C9.3 Diesel Engine Assembly for CAT 336E (379-3736)
  Remanufactured
• MAIN VALVE:
  KMX32NB 428-2749 Main Control Valve Assembly for Caterpillar 336E
  100% Brand New
• HYDRAULIC PUMP:
  SBS140 Main Hydraulic Pump Assembly for Caterpillar 336E
  100% Brand New
• SWING MOTOR:
  M5X180 Swing Motor Assembly for Caterpillar 336E
  100% Brand New
• BRAND CATALOG:
  View All Caterpillar Excavator & Heavy Equipment Parts Collection

Get Wholesale Factory Quote for CAT 336E Final Drive 507-9338

Looking for direct factory pricing, stock availability, or 12-month warranty terms for Cat 336E 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!