Charge, drive and Posi-Power pressure checks on the hydrostatic system anchor the Terex PT-100 Forestry service manual PDF, a 94-page book (OEM ID 2085-249) for this rubber track loader that widens to pump, undercarriage, radiator and loader valve teardown. Hydraulic schematics trace the charge, auxiliary and drive circuits through the lift arm control valve and pilot gen block, and a wiring diagram maps the electrical attachment outlet. Maintenance takes up roughly a quarter of the book, running from the air cleaner and grease fittings through drive belt tension, cooler air flow testing and fan cleaning to the maintenance schedule. Set track tension at 3/4 in (1.9 cm) to 1 in (2.5 cm) of deflection under 90 lbs (41 kg) of down force; drive pump relief sits at 5500 psi (380 bar). A made-up relief figure finds your weakest hose first. Bought once, the bookmarked, text-searchable PDF stays yours for as long as this loader is in your fleet.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Product Safety | 5-10 | Basic Precautions (Safety Labels, Personal Protective Equipment, Entering and Exiting) |
| Technical Specifications | 11-12 | Specifications (Engine, Transmission, Drive Motors), Loader Valve, Critical Torque Specs, Charge Pump |
| Circuit Diagrams | 13-18 | Hydraulic Charge Circuit, Hydraulic Auxiliary Circuit, Hydraulic Drive Circuit, Lift Arm Control Valve, Hyd. Pilot Gen Block, Electrical Attachment Outlet |
| Machine Controls and Instrumentation | 19-20 | Machine Controls (Loader Control, Drive Control, Throttle), Instrumentation, Switches |
| Operator Enclosure Disassembly and Assembly | 21-26 | Operator Enclosure Disassembly and Assembly Procedures, Gauge Panel Removal and Installation, Ignition Switch Removal and Installation, Gauge Removal and Installation |
| Fuel Tank Disassembly and Assembly | 27-30 | Disassembly and Assembly Procedures, Fuel Sending Unit Removal & Installation, Fuel Tank Removal, Fuel Tank Installation, Machine Preparation, Personal Safety |
| Radiator/Oil Cooler Disassembly and Assembly | 31-36 | Radiator/Oil Cooler Disassembly and Assembly Procedures, Fan Guard Removal and Installation, Fan Removal, Fan Installation, Radiator/Cooler Removal, Radiator/Cooler Installation |
| Loader/Transmission Controls Disassembly and Assembly | 37-40 | Loader/Transmission Controls Disassembly and Assembly Procedures, Joystick Removal and Installation, Loader Float Magnet Removal and Installation, Machine Preparation |
| Hydrostatic & Aux. Pump Disassembly and Assembly | 41-46 | Hydrostatic & Hydraulic Pump Disassembly and Assembly Procedures, Charge Pump Removal, Auxiliary Pump Removal, Auxiliary Pump Installation, Tandem Pump Removal |
| Undercarriage Disassembly and Assembly | 47-52 | Undercarriage Disassembly and Assembly Procedures, Sprocket Removal and Installation, Drive Motor Removal, Drive Motor Installation, Wheel Replacement, Wheel Installation |
| Maintenance | 53-76 | Air Cleaner, Grease Fittings, Undercarriages (Track Tension), Drive Sprocket Rollers, Tilt-Up Canopy (Jacking Procedure), Lift Arm Brace, Track Removal (Track Installation) |
| Lubricant & Fuel Specifications | 77-78 | Engine Oil, Engine Anti-Freeze/Coolant, Hydraulic Oil, Multi-Purpose EP Lithium Grease, Undercarriage Wheel Bearing Lube, Diesel Fuel |
| Troubleshooting | 79-82 | Preliminary Checkout (Visual Inspection), Troubleshooting Scenarios, Machine Preparation, Personal Safety |
| Hydraulic Pressure (Check & Adjustment) | 83-88 | Charge Pressure Check & Adjustment, Auxiliary Pressure Check & Adjustment (High Flow Troubleshooting), Low Flow Troubleshooting (Lift Arm Pressure Check) |
| Hydraulic Cylinder & Loader Valve | 89-94 | Disassembly & Assembly, Hydraulic Cylinder Disassembly, Hydraulic Cylinder Assembly, Loader Valve Disassembly, Loader Valve Assembly, Personal Safety |
Every system also includes chapter overview.
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Drive pumps Relief pressure | 5500 psi, 380 bar | p. 11 |
| Auxiliary Pump Relief pressure | 3300 psi (22,750 kPa) | p. 11 |
| Track tension deflection | 3/4" (1.9 cm) to 1" (2.5 cm) | p. 55 |
| Track tension check down force | 90 lbs (41 kg) | p. 55 |
| Hot oil light illumination temperature | 225°F (107.5°C) | p. 81 |
| Cooler bypass relief opening pressure | 80 PSI (561.7 kPa) | p. 81 |
| Engine Torque | 304 lb-ft (412 Nm) | p. 11 |
| Engine Idle RPM (Low) | 1000 rpm | p. 11 |
| Engine Idle RPM (High) | 2300 rpm | p. 11 |
| Engine Oil Capacity | 8.5 U.S. quarts (8.04 L) | p. 64 |
| Hydraulic System Oil Capacity | 20 U.S. gallons (75.71 L) | p. 77 |
| Hydraulic Fluid Change Interval | 500 hours | p. 66 |
