Caterpillar TH48-E80
Maintenance schedule, common problems & OEM parts breakdown
The Caterpillar TH48-E80 is a well service transmission designed for the oil and gas industry. It delivers 1715 bkW (2300 bhp) gross input power. The unit weighs 2213 kg (4878 lb). It measures 1984.4 mm (78.13 in) in length. The transmission uses a straight spur planetary gear type. It offers 8 forward gears and 0 reverse gears. Ideal applications include pressure pumping, kill mud pumps, coil tubing pump support, nitrogen units, and acidizing units. The TH48-E80 is optimized for use with Cat 3512B, Cat 3512C, and Cummins QSK50 engines.
The TH48-E80 replaced earlier TH48 series transmissions in the petroleum lineup. It succeeded the TH48-E70 in the product line. The TH48-E80 handles higher input power than the E70 variant. It supports 8F/0R gear configurations. The transmission uses Cat Transmission/Drive Train Oil-4 (TDTO). It features an integral torque converter with a 2.20 stall torque ratio. The unit uses electro-hydraulic fully modulated clutches. It includes a 10 micron synthetic cartridge remote mount filter. The TH48-E80 remains relevant in the used market for retrofitting older well service units. It provides durability for high-torque applications.
Below: full specifications, fluids & capacities, the factory service schedule, common service parts, verified fault codes, what owners discuss, attachment guidance, the complete assembly directory, and a serial-number reference. Complete parts lists with full OEM part numbers, exploded diagrams, quantities, and fitment data are available free in Heavy Parts AI.
Caterpillar TH48-E80 specifications
Engine
| Compatible Engine Models | Cat 3512B, Cat 3512C, Cummins QSK50 (optimized use); Cummins QSK45 listed in standard equipment |
| Gross Input Power | 1715 bkW (2300 bhp) |
| Gross Peak Input Torque | 9024 N·m (6556 ft-lb) |
| Rated Input Speed | 1900 r/min |
Weights
| Transmission Weight | 2213 kg (4878 lb) |
Dimensions
| Length | 1984.4 mm (78.13 in) |
| Width | 859.9 mm (33.85 in) |
| Height | 1177 mm (46.34 in) |
Performance
| Gear Configuration | 8 Forward / 0 Reverse |
| Gear Ratios | 1F: 3.34, 2F: 2.45, 3F: 2.20, 4F: 1.81, 5F: 1.62, 6F: 1.36, 7F: 1.19, 8F: 1.00 |
| Gear Type | Straight spur planetary |
| Torque Converter Stall Ratio | 2.20 |
| Torque Converter Series | TC58927-ESLF |
| Transmission Rotation | Input: counterclockwise; Output: counterclockwise (as viewed from rear) |
Service capacities (summary)
| Hydraulic Fill Capacity | Approx. 152 L (40 gal), subject to cooler size, lines, and installation |
| Oil System Fluid | Cat Transmission/Drive Train Oil-4 (TDTO) |
| Filter Type | 10 micron synthetic, cartridge remote mount |
Values vary by configuration, region, and serial range — confirm against your machine before planning transport or lifts.
TH48-E80 fluids & capacities
| System | Capacity | Recommended fluid |
|---|---|---|
| Transmission/Drive Train Hydraulic System | 152 L (40 gal) | Cat Transmission/Drive Train Oil-4 (TDTO) |
Capacities are refill values from factory literature — always fill to the dipstick/sight gauge, not the number.
Caterpillar TH48-E80 maintenance schedule
| Service interval | Tasks |
|---|---|
| Every 10 h |
|
| Every 250 h |
|
| Every 500 h |
|
| Every 1,000 h |
|
| Every 2,000 h |
|
Servicing the TH48-E80 beyond the schedule
Predictive Maintenance & Fluid Analysis
Monitor transmission oil condition using Scheduled Oil Sampling (S.O.S). Check for wear metals in the Cat Transmission/Drive Train Oil-4 (TDTO). Inspect the 10 micron synthetic cartridge remote mount filter for contamination. Verify hydraulic fill capacity of approximately 152 L (40 gal) during service. Check sump oil temperatures against operating limits. Analyze coolant for glycol content and corrosion inhibitors. Track engine oil viscosity and fuel dilution in the Cat 3512B or Cummins QSK50 engine. Early detection of ferrous particles prevents clutch wear.
Corrective & Common Repairs
Address torque converter issues by checking for air or water in the sight gauge. Ensure the transmission runs in NEUTRAL at operating temperature for accurate oil level readings. Use a magnet to separate ferrous particles from nonferrous debris during visual checks. Inspect the integral torque converter series TC58927-ESLF for seal leaks. Replace worn electro-hydraulic clutches if modulation fails. Check the SAE #0 flywheel input connection for alignment. Verify the GWB 390.60/GWB 390.65 output yoke mounting bolts.
Overhaul & Rebuild Points
Rebuild the straight spur planetary gear set at 2000-hour intervals or upon failure. Replace all multidisc clutches if slip exceeds specifications. Inspect the 8F/0R gear ratios for wear. Check the 2.20 stall torque ratio of the torque converter. Service the final drive oil and swing drive oil. Inspect the SAE 8 bolt (J704) Power Take-Off drive mounting. Replace the Electronic Clutch Pressure Control (ECPC) valves if software codes do not match. Evaluate the 24V electrical system and SAE J1939 data link integrity.
Seasonal & Environment Servicing
Adjust intervals for dust, sand, or quarry environments. Clean radiator and oil cooler fins daily in dusty conditions. Check air filter primary element more frequently. Inspect hydraulic hoses for abrasion from debris. Verify track tension and shoe condition for stable mounting. Check coolant level and cap integrity before cold starts. Drain water from the fuel separator daily in humid climates. Inspect the 2 oil cooler lines for leaks. Ensure the 2200+ dealer network support is available for regional service.
TH48-E80 common service parts
| Part number | Part | Notes | |
|---|---|---|---|
| 328-3655 | Filter Element As-Oil | Hydraulic service | Check fitment → |
| 1R-1809 | Filter Element-Oil | Lubrication service | Check fitment → |
| 244-0393 | Filter Element-Transmission | Scheduled service item | Check fitment → |
| 244-0395 | Filter Element-Transmission | Scheduled service item | Check fitment → |
| 9S-8752 | Nut-Full | Scheduled service item | Check fitment → |
Always confirm against your machine's serial number — cross-check any part in Heavy Parts AI before ordering.
TH48-E80 fault codes & troubleshooting
| Code | Meaning | Likely cause | What to do |
|---|---|---|---|
| 110-0 | Engine Coolant Temperature — Above Normal | Low coolant level, failed thermostat, or water pump issue | Inspect cooling system, refill coolant, test thermostat |
| 110-3 | Engine Coolant Temperature Sensor — Voltage High | Open circuit or sensor failure | Check wiring; replace sensor if confirmed faulty |
| 174-3 | Engine Fuel Temperature — Voltage Above Normal | Open circuit in sensor wiring | Inspect harness and replace sensor if necessary |
| 190-8 | Engine Speed — Abnormal Frequency | Speed sensor air gap, sensor failure, or tone ring damage | Check sensor gap; test speed sensor and tone ring |
| 41-3 | 8-Volt DC Supply — Voltage Above Normal | Short to power on 8V reference circuit | Inspect sensors sharing the 8V supply and isolate fault |
| 41-4 | 8-Volt DC Supply — Voltage Below Normal | Short to ground on 8V reference circuit | Disconnect sensors one at a time to locate short |
| 2348-9 | SAE J1939 Data Link #2 — Abnormal Update Rate | CAN bus wiring damage or termination fault | Check CAN wiring and measure termination resistance |
| E360 (High) | Engine Coolant Temperature — High | Low coolant, failed thermostat, or water pump issue | Diagnose cooling system; do not operate until resolved |
| E361 (High) | Engine Coolant Temperature — Very High (Shutdown) | Severe cooling system failure | Engine shutdown required; perform full cooling system diagnosis |
| 2458-2 | DPF #1 Differential Pressure — Erratic | Plugged pressure ports or failing sensor | Clean pressure ports; test sensor; verify DPF soot load |
Codes and remedies are general guidance for this model family — always confirm with diagnostic tooling and your dealer before major repairs.
TH48-E80 attachments & work tools
Pressure Pumping Units
The TH48-E80 is optimized for pressure pumping applications, providing the necessary power transmission for high-torque demands. It connects to the prime mover via an SAE #0 flywheel interface and delivers power through a GWB 390.60 or GWB 390.65 output yoke. The unit supports 8 forward and 0 reverse gears with ratios ranging from 3.34 to 1.00 to match pump speed requirements.
Kill Mud Pump Support
Configured for kill mud pump drive, the transmission utilizes an integral torque converter with a stall torque ratio of 2.20 to handle shock loads. The electro-hydraulic fully modulated clutches are oil-cooled and controlled by Cat Electronic Clutch Pressure Control (ECPC). This setup ensures smooth engagement and precise speed control for mud pumping operations.
Coil Tubing Pump Support
For coil tubing pump support, the TH48-E80 offers a rated input speed of 1900 r/min and a gross input power of 1715 bkW (2300 bhp). The straight spur planetary gear type provides durable power transfer for continuous duty cycles. The unit includes a Power Take-Off drive with an SAE 8 bolt (J704) mounting type for auxiliary equipment integration.
Nitrogen and Acidizing Units
The transmission is suitable for nitrogen and acidizing unit applications where variable speed control is critical. It operates with Cat Transmission/Drive Train Oil-4 (TDTO) and requires a hydraulic fill capacity of approximately 152 L (40 gal). The electronic control unit communicates via an SAE J1939 data link for system monitoring and diagnostics.
Engine Compatibility
The TH48-E80 is optimized for use with Cat 3512B, Cat 3512C, and Cummins QSK50 engines. Input rotation is counterclockwise, and output rotation is counterclockwise as viewed from the rear. The gross peak input torque capacity is 9024 N·m (6556 ft-lb) at the rated input speed.
Mounting and Dimensions
The transmission weighs 2213 kg (4878 lb) with overall dimensions of 1984.4 mm (78.13 in) in length, 859.9 mm (33.85 in) in width, and 1177.0 mm (46.34 in) in height. Structural application is subject to Caterpillar approval, and the unit requires two oil cooler lines and one electrical connector for installation.
All TH48-E80 assemblies by section
Every catalogued assembly group for the Caterpillar TH48-E80. Open an assembly to preview the parts inside — full OEM part numbers are available in Heavy Parts AI.
Basic Transmission
261-3046 Gear Gp-Transfer -Pump Drive
| 1T***43 | Ball Bearing | 1 |
| 26***46 | Gear Group-Transfer; -Pump Drive | 1 |
| 26***84 | Shaft | 1 |
261-3043 Planetary Gp-Transfer Gear -Speed Increase
| 03***29 | Bolt; (1/4-20x0.347-In) | 8 |
| 09***40 | Ring; (Retaining) | 1 |
| 26***43 | Planetary Group-Transfer Gear; -Speed Increase | 1 |
258-8742 Planetary Gp-Transmission
| 06***58 | Ball Bearing | 1 |
| 09***13 | Ring | 1 |
| 09***40 | Ring; (Retaining) | 1 |
291-3730 Planetary Gp-Transmission
| 06***58 | Ball Bearing | 1 |
| 09***40 | Ring; (Retaining) | 1 |
| 09***42 | Ring-Retaining | 1 |
267-7506 Power Train Ar
| 25***40 | Transmission Ar | 1 |
| 26***44 | Coupling Group-Flexible; -Engine, Converter | 1 |
| 26***70 | Plate & Film Group | 1 |
315-0054 Transmission Ar
| 24***21 | Filter Group-Oil; -Transmission | 2 |
| 25***43 | Torque Converter Group | 1 |
| 26***41 | Housing Group-Torque Converter | 1 |
315-0051 Transmission Ar
| 26***70 | Plate & Film Group | 1 |
| 27***50 | Electronics Group-Power Train | 1 |
| 29***61 | Mounting Group-Torque Converter | 1 |
325-4676 Transmission Ar
| 25***41 | Control Group-Transmission Hydraulic | 1 |
| 25***43 | Torque Converter Group | 1 |
| 26***41 | Housing Group-Torque Converter | 1 |
315-0052 Transmission Ar
| 26***70 | Plate & Film Group | 1 |
| 27***50 | Electronics Group-Power Train | 1 |
| 29***15 | Flywheel Group | 1 |
315-0053 Transmission Ar
| 24***21 | Filter Group-Oil; -Transmission | 2 |
| 25***43 | Torque Converter Group | 1 |
| 26***41 | Housing Group-Torque Converter | 1 |
290-3262 Transmission Ar
| 24***21 | Filter Group-Oil; -Transmission | 2 |
| 24***93 | Filter Element-Transmission | 1 |
| 24***95 | Filter Element-Transmission | 1 |
290-0059 Transmission Ar
| 26***70 | Plate & Film Group | 1 |
| 29***59 | Transmission Ar | 1 |
| 29***62 | Transmission Ar | 1 |
308-5698 Transmission Ar
| 26***70 | Plate & Film Group | 1 |
| 29***61 | Mounting Group-Torque Converter | 1 |
| 30***98 | Transmission Ar | 1 |
295-9193 Transmission Ar
| 26***70 | Plate & Film Group | 1 |
| 29***62 | Transmission Ar | 1 |
| 29***93 | Transmission Ar | 1 |
Electrical System
329-3333 Electronics Gp-Power Train
| 32***25 | Software Group-Power Train | 1 |
| 32***26 | Service Group-Power Train | 1 |
| 32***33 | Electronics Group-Power Train | 1 |
273-3750 Electronics Gp-Power Train
| 27***50 | Electronics Group-Power Train | 1 |
| 32***04 | Software Group-Power Train | 1 |
| 32***05 | Service Group-Power Train | 1 |
198-8761 Sensor Gp-Position
| 19***61 | Sensor Group-Position; (Transmission Speed) | 1 |
| 7B***42 | Bolt, Hex. Hd., 1/4in.-20 N.C. X 1 1/4in. | 2 |
| 7T***76 | Spacer; (1.22-mm Thk) | 1 |
216-0280 Sensor Gp-Position
| 21***80 | Sensor Group-Position; (Transmission Speed) | 1 |
| 7B***42 | Bolt, Hex. Hd., 1/4in.-20 N.C. X 1 1/4in. | 2 |
| 7T***76 | Spacer; (1.22-mm Thk) | 1 |
201-6615 Sensor Gp-Speed
| 13***60 | Bracket | 1 |
| 18***29 | Harness As-Sensor; (Speed) | 1 |
| 20***15 | Sensor Group-Speed; -Low Output | 1 |
9x-5392 Sensor Gp-Speed
| 17***49 | Strap; (Marker) | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
| 8T***32 | Receptacle-Connector; (3-Pin)(Throttle Position Sensor) | 1 |
3e-8700 Sensor Gp-Temperature
| 10***08 | Kit; (Connecting Plug) (3 Pin) (Includes Plug As And Wedge) | 1 |
| 10***13 | Seal; (3 Pin Plug) | 1 |
| 3E***00 | Sensor Group-Temperature; -Transmission Oil | 1 |
164-7577 Switch Gp-Bypass
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 16***77 | Switch Group-Bypass; -Xmsn Lubrication Supply Filter-Xmsn Lubrication Charge Filter-Hoist Screen-Tc, Front Brake Cooling-Transmission Oil Filter-Rear Axle Oil Filter | 1 |
| 18***35 | Pin-Connector; (16-Ga To 18-Ga) | 2 |
267-7489 Wiring Gp-Electronic Control
| 11***83 | Socket-Lamp | 1 |
| 11***84 | Terminal-Receptacle; (16-Ga To 18-Ga) | 2 |
| 15***76 | Mount-Isolation | 8 |
261-3055 Wiring Gp-Transmission
| 10***03 | Kit; (Receptacle) (3-Pin) (Includes Receptacle As & Wedge) | 2 |
| 13***00 | Clip; (Tab) | 1 |
| 13***01 | Clip | 1 |
Service Equipment And Supplies
261-3070 Plate & Film Gp
| 26***70 | Plate & Film Group | 1 |
| 7E***00 | Film-Information; (Lift Eye Location) | 5 |
| 8T***71 | Plate-Serial Number On Back Of Moldboard-Near Top At Right End | 1 |
Transmission Case &Amp; Mounting
261-3042 Case & Parts Gp-Planetary
| 09***83 | Plug, Tapered | 2 |
| 0S***88 | Bolt,Machine; Hose Assembly Mounting,Hose Assembly To Transmission,And To Torque Converter | 3 |
| 0T***72 | Bolt; 7/16" Diameter X 1 1/2" Length Generator To Engine | 8 |
261-3053 Cover Gp-Shipping
| 1F***58 | Nut-Full; (1/2-13-Thd)(Air Lines) | 4 |
| 26***53 | Cover Group-Shipping | 1 |
| 26***98 | Cover-Shipping | 1 |
Transmission Input
284-9298 Coupling Gp-Flexible
| 13***01 | Bolt; (M16x2x80-mm) | 12 |
| 28***80 | Washer; (16.3x31.5x1.75-mm Thk) | 12 |
| 28***35 | Seal-O-Ring | 1 |
285-7262 Coupling Gp-Flexible
| 28***35 | Seal-O-Ring | 1 |
| 28***91 | Coupling As | 1 |
| 28***95 | Bearing-Sleeve | 1 |
261-3044 Coupling Gp-Flexible -Engine, Converter
| 26***44 | Coupling Group-Flexible; -Engine, Converter | 1 |
| 26***75 | Coupling As | 1 |
| 5P***39 | Washer-Hard; (28x42x4-mm Thk) | 12 |
285-7261 Coupling Gp-Flexible -Engine, Converter
| 28***90 | Coupling As | 1 |
| 28***61 | Coupling Group-Flexible; -Engine, Converter | 1 |
| 8M***30 | Bolt-12 Point Head (1/2-13x1.25in); (1/2-13x1.25-In) | 16 |
297-1462 Flywheel Gp
| 13***01 | Bolt; (M16x2x80-mm) | 12 |
| 28***80 | Washer; (16.3x31.5x1.75-mm Thk) | 12 |
| 28***63 | Flywheel | 1 |
296-6515 Flywheel Gp
| 13***01 | Bolt; (M16x2x80-mm) | 12 |
| 28***80 | Washer; (16.3x31.5x1.75-mm Thk) | 12 |
| 29***06 | Flywheel | 1 |
261-3047 Gear Gp-Idler -Pump Drive, Upper
| 26***47 | Gear Group-Idler; -Pump Drive, Upper | 1 |
| 26***96 | Shaft | 1 |
| 26***97 | Gear; (39-Teeth) | 1 |
261-3049 Gear Gp-Idler -Auxiliary Pump
| 0T***20 | Bolt (1.25 In. Long X .438 In. Dia.) | 8 |
| 11***24 | Washer; (12.2x16x3-mm Thk) | 10 |
| 18***69 | Gasket | 1 |
261-3041 Housing Gp-Torque Converter
| 03***13 | Seal-O-Ring | 2 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 6 |
| 0T***18 | Bolt Strap To Front Cover | 10 |
292-3561 Mounting Gp-Torque Converter
| 29***61 | Mounting Group-Torque Converter | 1 |
| 4K***75 | Bolt-12 Point Head 38.1mm (1.501in) Long | 15 |
| 8M***30 | Bolt-12 Point Head (1/2-13x1.25in); (1/2-13x1.25-In) | 1 |
258-8743 Torque Converter Gp
| 0S***66 | Bolt-Pulley To Crankshaft Adapter | 24 |
| 0S***94 | Bolt (1 In. Long 3/8 In. Dia.); Plate Assembly To Support Assembly | 8 |
| 0S***95 | Bolt 1.25 In. (31.75 mm) Long Guard Assemblies To Radiator Guard | 12 |
Transmission Oil System
9w-4119 Actuator Gp-Rotary
| 1B***75 | Bolt (" " " ); Bolt ( " " " ) | 2 |
| 1J***71 | Seal (10.52 Degrees I.D.); Seal-O-Ring -- To Adapter | 2 |
| 3F***52 | Ball (Small) | 1 |
249-2304 Base Gp-Oil Filter -Transmission
| 13***98 | Spring | 1 |
| 16***77 | Switch Group-Bypass; -Xmsn Lubrication Supply Filter-Xmsn Lubrication Charge Filter-Hoist Screen-Tc, Front Brake Cooling-Transmission Oil Filter-Rear Axle Oil Filter | 1 |
| 24***04 | Base Group-Oil Filter; -Transmission | 1 |
333-9310 Base Gp-Oil Filter -Transmission
| 16***77 | Switch Group-Bypass; -Xmsn Lubrication Supply Filter-Xmsn Lubrication Charge Filter-Hoist Screen-Tc, Front Brake Cooling-Transmission Oil Filter-Rear Axle Oil Filter | 1 |
| 2S***78 | Seal-O-Ring (Id=37.47mm) | 1 |
| 33***10 | Sealing Washer, Base Group-Oil Filter; -Transmission | 1 |
258-8741 Control Gp-Transmission Hyd
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 2 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 2 |
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 2 |
314-9942 Control Gp-Transmission Hyd
| 0L***51 | Bolt Starting Engine Fuel Tank Bracket To Diesel Intake Manifold | 2 |
| 0L***70 | Bolt (2-1/4") Filler Tube Assembly To Transfer Drive Case | 2 |
| 0S***09 | Bolt (3/4") Filler Tube Assembly To Transfer Drive Case | 2 |
244-0121 Filter Gp-Oil
| 13***29 | Seal-O-Ring | 1 |
| 1R***09 | Filter Element-Oil; (Ultra High Efficiency)(Power Train) | 1 |
| 24***21 | Filter Group-Oil; -Transmission | 1 |
333-6434 Filter Gp-Oil
| 13***29 | Seal-O-Ring | 1 |
| 32***67 | Housing Group-Filter | 1 |
| 32***55 | Filter Element As-Oil; (Advanced Efficiency)(Power Train) | 1 |
261-3051 Manifold Gp-Control -Relief Valves
| 06***55 | Seal-O-Ring (Id=47.22mm) | 1 |
| 0S***85 | Bolt; 12.7 mm (1/2") Diameter X 38.1 mm (1 1/2") Length Generator To Engine | 4 |
| 13***00 | Clip; (Tab) | 1 |
261-3048 Pump Gp-Gear
| 03***31 | Seal-O-Ring | 2 |
| 0S***95 | Bolt 1.25 In. (31.75 mm) Long Guard Assemblies To Radiator Guard | 2 |
| 0T***72 | Bolt; 7/16" Diameter X 1 1/2" Length Generator To Engine | 8 |
261-3050 Valve Gp-Lockup Clutch & Sync
| 03***70 | Seal-O-Ring; (7.59mm Id) | 3 |
| 06***40 | Seal-O-Ring (Id=37.69mm) | 1 |
| 0S***18 | Bolt; (5/16-18x1-In)(Hydraulic Pump) | 4 |
312-4306 Valve Gp-Lockup Clutch & Sync
| 26***50 | Valve Group-Lockup Clutch & Sync | 1 |
| 31***06 | Valve Group-Lockup Clutch & Sync | 1 |
| 5B***03 | Bolt -12.7 cm(5 In.) Long-Location "D" | 1 |
261-3378 Valve Gp-Pressure Control
| 16***78 | Body-Load Piston | 6 |
| 1S***36 | Retainer | 1 |
| 1S***38 | Ring-Retaining | 1 |
314-9930 Valve Gp-Selector & Press Cont
| 03***30 | Bolt-Self Locking; (5/16unc X 3/4) | 1 |
| 10***29 | Slug | 1 |
| 12***33 | Spring As | 2 |
261-3383 Valve Gp-Selector & Press Cont
| 03***30 | Bolt-Self Locking; (5/16unc X 3/4) | 1 |
| 10***29 | Slug | 1 |
| 12***33 | Spring As | 2 |
193-8559 Valve Gp-Solenoid
| 10***83 | Kit-Seal; (Solenoid Valve) | 1 |
| 10***02 | Kit-Receptacle; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 10***11 | Cartridge As | 1 |
314-9940 Valve Gp-Transmission Control
| 0S***18 | Bolt; (5/16-18x1-In)(Hydraulic Pump) | 7 |
| 1D***41 | Bolt 3.00 In.(7.62 cm) Long | 12 |
| 1F***11 | Bolt 3.50 In. (8.89 cm) Long | 1 |
261-3372 Valve Gp-Transmission Control
| 0S***18 | Bolt; (5/16-18x1-In)(Hydraulic Pump) | 7 |
| 1D***41 | Bolt 3.00 In.(7.62 cm) Long | 12 |
| 1F***11 | Bolt 3.50 In. (8.89 cm) Long | 1 |
Transmission Output
291-3731 Coupling Gp-Transmission
| 11***85 | Seal-O-Ring; (13.94mm Id) | 2 |
| 15***70 | Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***51 | Ring-Retaining | 1 |
325-4677 Coupling Gp-Transmission
| 11***85 | Seal-O-Ring; (13.94mm Id) | 2 |
| 15***70 | Kit-Connecting Plug; (2-Pin)(Engine Sensor Wiring Harness) | 1 |
| 18***51 | Ring-Retaining | 1 |
Frequently asked questions
What engine does the TH48-E80 use?
The TH48-E80 is a transmission optimized for use with Cat 3512B, Cat 3512C, and Cummins QSK50 engines.
What is the operating weight?
The transmission weighs 2213 kg (4878 lb).
What replaced the TH48-E80?
The TH48-E80 is a non-current product. It succeeded the TH48-E70 in the Caterpillar petroleum transmission lineup.
What TH48-E80 owners discuss
What engine configurations are the TH48-E80 transmission optimized for, and what is its gross input power rating?
What are the key powertrain and hydraulic behaviors regarding the torque converter and clutch modulation?
What are the typical wear patterns or maintenance requirements for the transmission oil system?
What electrical and sensor issues are associated with the TH48-E80 control system?
What should be checked when buying a used TH48-E80 transmission?
What are the physical dimensions and weight specifications of the TH48-E80?
What safety-critical procedures apply to checking the transmission oil level?
Compiled from owner and technician discussions across the industry — experiences vary by serial range and machine history.
Need a specific TH48-E80 part?
Search live OEM part data, check fitment, and cross-reference alternatives with Heavy Parts AI.