Reliable 160-1835 Power Train Oil Gear Pump GP for CAT D8R Track-Type Tractor with 3406E Engine – Gear Pump Assembly

The power train oil pump is the lifeline of your tractor‘s transmission and torque converter. For the Caterpillar D8R track-type tractor powered by the 3406E engine, the 160-1835 gear pump GP (also referenced as 1601835) supplies essential hydraulic flow for lubrication, cooling, and clutch operation. A failing power train pump can lead to sluggish shifting, overheating, or complete transmission failure. This OEM-grade gear pump restores proper oil circulation. As a result, your D8R operates reliably in the toughest dozing and ripping applications.

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What Is a Power Train Oil Gear Pump?

A power train oil pump is a multi-section gear pump. It draws oil from the sump and distributes it to critical components. In the D8R tractor, the 160-1835 gear pump GP is a three-section pump. It provides flow for the torque converter, transmission clutches, and bevel gear lubrication. This pump is mounted on the front of the transmission case. It is driven directly by the engine through a drive gear. Therefore, pump speed is proportional to engine RPM.

The 160-1835 pump is a fixed displacement gear pump. It uses precision-machined gears inside a cast iron housing. As the gears rotate, they trap oil and push it through the outlet ports. Consequently, consistent flow is delivered regardless of load. This design is simple and extremely durable. It is ideal for heavy-duty applications like the D8R tractor.

Technical Highlights (Three-Section Pump Design)

The 160-1835 gear pump GP features a unique three-section design:

• Section One (Charge/Supply): Draws oil from the bevel gear case. It directs oil through the power train oil filter. Then it supplies the priority valve. This provides oil to the parking brake, service brake valve, and transmission control valve for clutch operation.

• Section Two (Torque Converter Charge): Draws oil from the bevel gear case. It directs oil to the regulating relief valve. Then it supplies the torque converter as charging oil. It also lubricates the flywheel housing.

• Section Three (Scavenge/Return): Removes oil from both the transmission and torque converter cases. It directs this oil to the bevel gear case for lubrication.

All converter outlet oil is routed through the engine-mounted oil cooler. It then returns to the brakes, transmission, and bevel gears as cooling and lubrication oil.

Gear Pump Specifications

• Part Number: 160-1835 (1601835)

• Pump Type: Fixed displacement gear pump (three-section)

• Body Assembly: 161-9939

• Drive Gear Bore: 31.770 ± 0.008 mm (1.2508 ± 0.0003 in)

• Gear Length (3T-8757): 15.870 ± 0.008 mm (0.6248 ± 0.0003 in)

• Bearing Installation Depth: 1.50 ± 0.50 mm (0.059 ± 0.020 in) below machined surface

• Bearing Bore I.D. (After Installation): 31.798 ± 0.039 mm (1.2519 ± 0.0015 in)

• Bearing Joint Position: 30 ± 15 degrees from centerline

• Shaft Diameter (338-0315 / 6I-9200): 31.742 ± 0.005 mm (1.2497 ± 0.0002 in)

• Mounting: Front of transmission case, engine-driven

Engineered for CAT D8R and 3406E Engine

The 160-1835 gear pump GP is specifically designed for the Caterpillar D8R track-type tractor. It is also compatible with the D8R Series II. The pump is powered by the CAT 3406E engine.

3406E Engine Specifications (D8R Series II)

• Engine Model: 3406E TA

• Displacement: 14.6 L (893 in³)

• Configuration: 6-cylinder, in-line, 4-stroke-cycle diesel

• Bore × Stroke: 5.4 in × 6.5 in (137 mm × 165 mm)

• Gross Power (D8R II): 338 hp (252 kW) @ 2,000 rpm

• Flywheel Power (D8R II): 310 hp (231 kW) @ 2,000 rpm

• Fuel System: Electronic Unit Injection (EUI)

• Aspiration: Turbocharged and aftercooled (ATAAC)

Compatible CAT Tractor Models

This gear pump GP is a direct replacement for:

• D8R Series: D8R, D8R II

• D8 Series: D8, D8GC (with 374-1605 cross-reference)

• Additional Models: Some D8N applications (verify fitment)

Compatible Equipment (Partial List)

• Track-Type Tractors: D8R (AKA, 6YZ prefixes), D8R II, D8, D8GC

• Wheel Loaders (374-1605 equivalent): 980G, 980G II

• Articulated Trucks: D350E II, D400E II

• Motor Graders: Some 16H variants (verify)

Cross-Reference Part Numbers

• 160-1835, 1601835 (OEM)

• 20R-8012 (Alternate sourcing number)

• 374-1605 (Transmission pump GP for D8R/D8GC – superseding/similar application)

• 161-9939 (Body assembly – service component)

Why Choose This Gear Pump GP?

1. Three-section design for complete power train coverage. One pump handles charge, converter supply, and scavenge functions. Therefore, system complexity is reduced.

2. Precision-machined gears. Gears are ground to exact tolerances (bore: 31.770 ± 0.008 mm). This ensures high volumetric efficiency and consistent flow.

3. Durable cast iron housing. The housing resists warping and cracking. It also dampens vibration. Consequently, the pump lasts longer in severe conditions.

4. Direct engine drive. The pump is driven directly from the engine. This provides reliable oil flow at all operating speeds. No belts or external drives are needed.

D8R Power Train Transmission Pump

The 160-1835 is often called the transmission pump or torque converter pump. It is critical for D8R tractor operation. The pump supplies oil to the planetary power shift transmission. This transmission features three speeds forward and three speeds in reverse. It uses large diameter, oil-cooled clutches. Without proper pump flow, these clutches slip and burn. Consequently, the tractor loses pushing power.

Common Transmission Pump Part Numbers for D8R:

Signs Your Gear Pump Needs Replacement

• Delayed or sluggish transmission engagement. The clutches are not getting enough oil flow.

• Overheating power train oil. Reduced flow causes excessive friction and heat.

• Loss of torque converter stall speed. The converter is not receiving proper charge oil.

• Unusual noise from pump area. Whining or grinding indicates internal gear wear.

• External oil leaks from pump body. Lip seals may be worn or damaged.

• Air in power train oil (foaming). Check inlet fittings for leaks. Inspect the main screen and torque converter scavenge screen for obstructions.

• Low power train oil pressure warning light. This is the most urgent sign. Stop operation immediately.

Failure Causes

The 160-1835 gear pump GP is very durable. However, failures can occur due to:

• Contaminated oil. Sand and debris wear the gears and bearings. This is a common cause in mining environments.

• Oil starvation. Low oil levels or restricted suction screens cause cavitation. This damages internal components quickly.

• Extended service intervals. Old oil loses its lubricating properties. It also carries more contaminants.

• Defective body assembly (known issue). In some early pumps, the drain passage for the idle gear shaft was not drilled deep enough. This allowed pressure to build on the shaft end. Consequently, the shaft pushed into the rear cover. The result was excessive gear-to-cover clearance and loss of pressure. If your pump shows unusual rear cover wear, inspect the body assembly.

Installation Recommendations

Follow these steps for proper replacement. First, drain the power train oil completely. Second, remove the bottom guard for access.

Clean the pump mounting area thoroughly. Then, disconnect all oil lines. Label them for correct reconnection. Remove the mounting bolts and pull the pump forward.

Before installing the new 160-1835 gear pump GP, lubricate all components with clean oil. The pump must turn freely by hand. Install new O-ring seals. Tighten mounting bolts to CAT specifications.

Refill with approved power train oil. Start the engine at low idle. Check for leaks. Finally, verify transmission operation and oil pressure.

Important known defect check: During replacement, inspect the 161-9939 body assembly. Ensure the drain passage for the idle gear shaft is properly machined. The drilled passage must intersect the bearing bore. If not, replace the body assembly with an updated version.

Conclusion

The 160-1835 (1601835) power train oil gear pump GP for CAT D8R track-type tractor with 3406E engine is a vital component for transmission and torque converter health. Its three-section design provides charge, supply, and scavenge functions in one unit. Whether you are maintaining a D8R or rebuilding a D8R II, this direct replacement gear pump restores reliable oil flow and power train performance.

Order your 160-1835 gear pump GP today. Keep your CAT D8R pushing strong.