The undercarriage, tandem drive pump, lift arm control valve, drive motors and quick attach each run from removal through reinstallation in this 141-page Terex PT-70, PT-80 service manual PDF (OEM ID 2046-310) for both rubber track loaders. Hydraulic circuit diagrams trace the charge, auxiliary and drive circuits and the pilot generation solenoid block, while a separate drawing covers the electrical attachment outlet. Pressure testing and hydraulic rebuilds fill a good share of the book, taking you through charge, auxiliary and Posi-Power checks before you split a drive pump or motor brake. Replace motor brake clutch discs as a set if any measures under .015 in (.38 mm); tandem pump mounting bolts go back at 85 lb-ft (115 Nm). Alone with a stalled loader, there is nobody to ask. Bookmarked chapters and a searchable text layer help you pin down the exact pump or valve, so the part you order is right the first time.
What's Inside This Terex PT-70, PT-80 Manual
| System | Pages | Key Topics |
|---|---|---|
| Product Safety | 7-12 | Safety Messages, Information Messages, Basic Precautions, Safety Labels, Protective Equipment, Entering and Exiting, Lifting, Hot Fluids and Components |
| Technical Specifications | 13-14 | Specifications (Engine, Transmission, Drive Pumps) |
| Circuit Diagrams | 15-22 | Hydraulic Charge Circuit, Hydraulic Auxiliary Circuit, Hydraulic Drive Circuit, Lift Arm Control Valve, Hydraulic Pilot Generation Solenoid Block, Electrical Attachment Outlet |
| Maintenance | 23-42 | Lift-Arm Brace, Tilt-Up Cab, Jacking Procedure, Grease Fittings, Undercarriages, Track Tension, Drive Sprocket Rollers, Track Removal |
| Machine Controls and Instrumentation | 43-44 | Machine Controls, Throttle, Instrumentation, Switches, Lift Arm Control, Drive Control |
| Operator Enclosure | 45-48 | Machine Preparation, Removal & Installation (Door Gas Spring, Removal Procedure, Installation Procedure) |
| Chassis and Fuel Tank | 49-54 | Machine Preparation, Removal & Installation (Fuel Sending Unit, Removal Procedure, Installation Procedure, Fuel Tank, Footwell, Foot Throttle Assembly, Hood Assembly) |
| Radiator and Oil Cooler | 55-58 | Machine Preparation, Removal & Installation (Fan Guard, Removal Procedure, Installation Procedure, Fan & Shroud, Radiator/Oil Cooler), Personal Safety |
| Hydraulic Reservoir | 59-66 | Machine Preparation, Removal & Installation (Hydraulic Reservoir, Removal Procedure, Installation Procedure, Suction Screen), Personal Safety |
| Lift Arm/Drive Controls | 67-70 | Machine Preparation, Removal & Installation (Joystick, Removal Procedure, Installation Procedure, Lift Arm Float Magnet, Lift Arm Control Valve), Personal Safety |
| Hydraulic Pumps/Motors | 71-78 | Machine Preparation, Removal & Installation (Charge Pump, Removal Procedure, Installation Procedure, Auxiliary Pump, Tandem Drive Pump, Drive Motor), Personal Safety |
| Engine | 79-86 | Removal & Installation (Battery, Removal Procedure, Installation Procedure, Exhaust System, Air Cleaner, Engine), Personal Safety |
| Undercarriage | 87-98 | Machine Preparation |
| Lift Arm Components | 99-104 | Machine Preparation, Removal & Installation (Lift Cylinder, Removal Procedure, Installation Procedure, Bucket/Tilt Cylinder, Q/C Block PRV), Personal Safety |
| Quick Attach | 105-108 | Machine Preparation, Removal & Installation (Locking Pin, Removal Procedure, Installation Procedure, Pivot Pin), Personal Safety |
| Hydraulic Component Service | 109-124 | Disassembly & Assembly (Hydraulic Cylinder, Disassembly Procedure, Assembly Procedure) |
| Hydraulic Pressure & Flow | 125-132 | Contamination Inspection |
| Troubleshooting | 133-136 | Visual Inspection, Engine/Machine Troubleshooting, Personal Safety |
| Lubricant and Fuel Specifications | 137-141 | Fluids & Fuel Specifications |
Every system also includes chapter overview.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Tandem pump mounting bolts torque | 85 lb. ft. (115 Nm) | p. 75 |
| Inch Fasteners 1/4" Torque | 9 +/- 2 lb ft | p. 139 |
| Clutch disc wear limit | less than .015” (.38mm) | p. 115 |
| Engine Oil Capacity | 9 qt. / 8.5l | p. 41 |
| Hydraulic Fluid Service Refill Capacity | 12.25 gal. / 46.4l | p. 41 |
| Radiator Coolant Capacity | 3.125 gal. / 11.8l | p. 41 |
| PT-70 | ||
| Engine Gross Horsepower | 71 hp (53 kW) | p. 13 |
| PT-80 | ||
| Engine Gross Horsepower | 80 hp (60 kW) | p. 14 |
