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Hydraulic Gear Pump 9T9839 9T-9839 CAT Caterpillar Bulldozer

Hydraulic Gear Pump 9T9839 9T-9839 CAT Caterpillar Bulldozer

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Product Detail

Product Description: Hydraulic Gear Pump 9T-9839 (9T9839) for Caterpillar Bulldozer

The Gear Pump 9T-9839 is a genuine OEM component manufactured by Caterpillar Inc. for the hydraulic and power train systems of its large track-type tractors. This fixed displacement gear pump is a key component that supplies oil flow for critical machine functions, including pilot hydraulic circuits, transmission lubrication, and implement control systems. It is specifically documented for use on the Cat D9N, D9R, and D9T Track-Type Tractors, as well as the 589X Pipelayer and other large Cat dozers that share the same powertrain architecture.

1. Primary Gear Pump Assembly

Part Number	Part Name / Description	Application / Notes
9T-9839 (also 9T9839)	PUMP GP‑GEAR / Gear Pump — Hydraulic & Power Train	Caterpillar D9N, D9R, D9T Track‑Type Tractors; 589X Pipelayer; large‑frame bulldozers and pipelayers; fixed displacement gear pump; provides pilot oil supply, implement hydraulic flow, and transmission lubrication; two‑section configuration; OEM genuine Caterpillar spare part

2. D9 Series Compatible Gear Pump Reference

Part Number	Part Name / Description	Application / Notes
134-8210	PUMP GP‑GEAR / Gear Pump (related)	Caterpillar D9R Track‑Type Tractor; alternative or superseded gear pump assembly for D9R applications; verified in Cat parts documentation

3. Component Parts for 9T-9839 Gear Pump (Internal & Mounting)

The following detailed component breakdown is based on Caterpillar‘s technical assembly instructions for the D9R power train gear pump:

Part Number	Part Name / Description	Application / Notes
7M-7456	Bearing Retaining Compound / Lubricant	Assembly lubricant/adhesive for securing bearings (57) and screws (56) during gear pump assembly
Part not specified in search results	Bearing (34)	Internal bearing component installed in housing (35) as part of gear pump assembly
Part not specified in search results	Pin (36)	Locating or retaining pin for gear assembly positioning
Part not specified in search results	Gear Assembly (37)	Complete gear set (drive gear and driven gear) installed in housing (35)
Part not specified in search results	Housing (35)	Main pump housing that contains the gear assembly and bearings
Part not specified in search results	Cover (11)	End cover for gear pump housing
Part not specified in search results	Gasket / Washer (10)	Sealing gasket or washer between cover and housing
Part not specified in search results	Bolt (9)	Cover mounting bolts
Part not specified in search results	Seal (5)	Shaft seal or housing seal
Part not specified in search results	Flange (6)	Mounting flange for pump installation
Part not specified in search results	Cage (4)	Retaining cage or housing component

4. Pilot Oil Circuit and Filter Components (Associated with 9T-9839)

The pilot oil circuit, which receives oil from the gear pump, includes the following documented Cat part numbers:

Part Number	Part Name / Description	Application / Notes
Pilot line (66)	Pilot Oil Line	Carries pilot oil from the pump to the pilot filter
Pilot filter (61)	Pilot Oil Filter Element	Filters pilot oil before it reaches the pilot manifold
Pilot line (60)	Pilot Oil Line	Carries filtered pilot oil from the filter to the pilot manifold
Pilot manifold (51)	Pilot Manifold	Distributes pilot oil to the hydraulic activation solenoid valve and control circuits

5. D9R & D9 Series Bulldozer — Key Hydraulic Specifications (For Reference)

Parameter	Value
Engine Model	Cat® 3408C (D9R)
Displacement	18 L (1099 in³)
Pump Type (Implement)	Piston‑type geared from flywheel
Hydraulic System Configuration	Fixed displacement closed‑center design; minimum system pressure maintained when implement control valves are inactive
Flow for Bulldozer/Ripper	Two‑section fixed displacement gear pump — large section and small section
Pilot Pump Location	Inside main pump compartment; shaft mechanically connected to main hydraulic pump shaft

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Product Detail

Product Description: Hydraulic Gear Pump 9T-9839 (9T9839) for Caterpillar Bulldozer

1. Primary Gear Pump Assembly

Part Number	Part Name / Description	Application / Notes
9T-9839 (also 9T9839)	PUMP GP‑GEAR / Gear Pump — Hydraulic & Power Train	Caterpillar D9N, D9R, D9T Track‑Type Tractors; 589X Pipelayer; large‑frame bulldozers and pipelayers; fixed displacement gear pump; provides pilot oil supply, implement hydraulic flow, and transmission lubrication; two‑section configuration; OEM genuine Caterpillar spare part

2. D9 Series Compatible Gear Pump Reference

Part Number	Part Name / Description	Application / Notes
134-8210	PUMP GP‑GEAR / Gear Pump (related)	Caterpillar D9R Track‑Type Tractor; alternative or superseded gear pump assembly for D9R applications; verified in Cat parts documentation

3. Component Parts for 9T-9839 Gear Pump (Internal & Mounting)

The following detailed component breakdown is based on Caterpillar‘s technical assembly instructions for the D9R power train gear pump:

Part Number	Part Name / Description	Application / Notes
7M-7456	Bearing Retaining Compound / Lubricant	Assembly lubricant/adhesive for securing bearings (57) and screws (56) during gear pump assembly
Part not specified in search results	Bearing (34)	Internal bearing component installed in housing (35) as part of gear pump assembly
Part not specified in search results	Pin (36)	Locating or retaining pin for gear assembly positioning
Part not specified in search results	Gear Assembly (37)	Complete gear set (drive gear and driven gear) installed in housing (35)
Part not specified in search results	Housing (35)	Main pump housing that contains the gear assembly and bearings
Part not specified in search results	Cover (11)	End cover for gear pump housing
Part not specified in search results	Gasket / Washer (10)	Sealing gasket or washer between cover and housing
Part not specified in search results	Bolt (9)	Cover mounting bolts
Part not specified in search results	Seal (5)	Shaft seal or housing seal
Part not specified in search results	Flange (6)	Mounting flange for pump installation
Part not specified in search results	Cage (4)	Retaining cage or housing component

4. Pilot Oil Circuit and Filter Components (Associated with 9T-9839)

The pilot oil circuit, which receives oil from the gear pump, includes the following documented Cat part numbers:

Part Number	Part Name / Description	Application / Notes
Pilot line (66)	Pilot Oil Line	Carries pilot oil from the pump to the pilot filter
Pilot filter (61)	Pilot Oil Filter Element	Filters pilot oil before it reaches the pilot manifold
Pilot line (60)	Pilot Oil Line	Carries filtered pilot oil from the filter to the pilot manifold
Pilot manifold (51)	Pilot Manifold	Distributes pilot oil to the hydraulic activation solenoid valve and control circuits

5. D9R & D9 Series Bulldozer — Key Hydraulic Specifications (For Reference)

Parameter	Value
Engine Model	Cat® 3408C (D9R)
Displacement	18 L (1099 in³)
Pump Type (Implement)	Piston‑type geared from flywheel
Hydraulic System Configuration	Fixed displacement closed‑center design; minimum system pressure maintained when implement control valves are inactive
Flow for Bulldozer/Ripper	Two‑section fixed displacement gear pump — large section and small section
Pilot Pump Location	Inside main pump compartment; shaft mechanically connected to main hydraulic pump shaft

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Hydraulic Gear Pump 9T9839 9T-9839 CAT Caterpillar Bulldozer

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Product Description: Hydraulic Gear Pump 9T-9839 (9T9839) for Caterpillar Bulldozer

1. Primary Gear Pump Assembly

2. D9 Series Compatible Gear Pump Reference

3. Component Parts for 9T-9839 Gear Pump (Internal & Mounting)

4. Pilot Oil Circuit and Filter Components (Associated with 9T-9839)

5. D9R & D9 Series Bulldozer — Key Hydraulic Specifications (For Reference)

Product Description: Hydraulic Gear Pump 9T-9839 (9T9839) for Caterpillar Bulldozer

1. Primary Gear Pump Assembly

2. D9 Series Compatible Gear Pump Reference

3. Component Parts for 9T-9839 Gear Pump (Internal & Mounting)

4. Pilot Oil Circuit and Filter Components (Associated with 9T-9839)

5. D9R & D9 Series Bulldozer — Key Hydraulic Specifications (For Reference)

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