Part of the Case Repair Manuals.
Tackling a major overhaul? This massive 958-page Service Manual PDF breaks down every hydrostatic drive, fuel injection pump, and loader linkage on your machine. Open up to factory wiring diagrams for tracing ignition faults, complete hydraulic schematics for the piston pump, and step-by-step teardown procedures for both gasoline and diesel engines. You get detailed powertrain troubleshooting charts and page after page of factory clearance specs. Verify the hydraulic system charge pressure hits 150 psi minimum with no load, and confirm the engine is pushing its rated 25 horsepower at 2800 rpm. Quit wasting hours diagnosing slow hydraulics without the right flow charts. This bookmarked manual opens on any phone or tablet, letting you jump straight to the fix and get back to work.
What's Inside This Case 1825 Uni-Loader Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 3-46 | Safety Rules, Service Manual Introduction |
| Engine Removal & Installation | 47-98 | Engine Removal, Engine Installation, Radiator Removal and Installation |
| Cylinder Head, Valve Train & Camshaft | 99-236 | Cylinder Head, Valve Train, Camshaft, Nissan A12 Gasoline Engine |
| Camshaft & Fuel Camshaft, Diesel | 237-294 | Engine Camshaft, Fuel Camshaft, Kubota V1100 4 Cylinder Diesel Engine |
| Cylinder Block, Pistons & Connecting Rods | 295-322 | Cylinder Block, Cylinder Liners, Pistons, Piston Rings, Connecting Rods |
| Crankshaft, Flywheel & Oil Seals | 323-448 | Crankshaft, Main Bearings, Flywheel, Oil Seal, Nissan A12 Gasoline Engine |
| Oil Pump | 449-460 | Lubrication |
| Cooling System | 461-494 | Radiator, Thermostat |
| Ignition System | 495-538 | Distributor, Spark Plugs, Nissan A12 Gasoline Engine |
| Fuel System | 539-662 | Carburetor, Fuel Injection Pump, Fuel Injectors and Glow Plugs |
| Electrical | 663-776 | Removal and Installation of Electrical Components, Electrical Specifications, Troubleshooting, And Schematics, Instruments and Gauges, Battery, Starter - Gasoline Engine |
| Power Train | 777-858 | Removal and Installation of Power Train Components, Maintenance, Hydrostatic System Troubleshooting, Piston Pump, Motor, Sprockets, Chains and Axles, Wheels and Tires |
| Hydraulics | 859-926 | Removal and Installation of Hydraulic Components, Maintenance, Hydraulic Schematics, Specifications, And Troubleshooting, Cleaning the Hydraulic System and Hydrostatic System |
| Mounted Equipment | 927-958 | Pedals and Levers, Loader, ROPS Canopy, Seat, Seat Belts, And Operators Compartment, Auxiliary Hydraulic Installation |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Air filter element replacement condition | when the warning lamp for the air cleaner is illuminated when the engine is running | p. 92 |
| Hydraulic system charge pressure (no load) minimum | 150 psi (1034 kPa, 10 bar) | p. 788 |
| Hydraulic system charge pressure (under load) minimum | 100 psi (690 kPa, 7 bar) | p. 788 |
| Engine horsepower (Gasoline/Diesel) | 25 at 2800 rpm (18.6 kW at 2800 r/min) | p. 42 |
| Engine overheating warning lamp illumination condition | more than 212° F (110°C) | p. 676 |
| Hydraulic System Equipment Control Valve Main Relief Setting | 2100 to 2200 psi (14 479 to 15 169 kPa, 143 to 150 bar) | p. 44 |
| Lift capacity to full height | 1600 pounds (726 kg) | p. 45 |
Case 1825 Uni-Loader Common Problems This Manual Covers
Case 1825 Uni-Loader hydraulic system loses charge pressure or lifts slowly under load p. 788
Run the hydraulic system charge pressure test on page 788. With the engine at full throttle, charge pressure must read at least 150 psi (1034 kPa) with no load and 100 psi (690 kPa) under load; below that, inspect the charge pump and relief valve parts for damage.
Manual Section: Power TrainEngine overheats or loses power during operation, temperature warning lamp stays on p. 676
Check the temperature warning lamp circuit on page 676; it only illuminates once engine temperature exceeds 212°F (110°C), confirming an actual overheat rather than a sensor fault. Verify coolant level, clean debris from the radiator fins, and check fan belt tension before assuming the 25 hp (18.6 kW) engine at 2800 rpm is underperforming.
Manual Section: ElectricalAir filter restriction warning lamp activates prematurely even with a clean element installed p. 92
Check page 92: the air filter element should only be cleaned or replaced when the warning lamp illuminates with the engine running, not on a fixed interval. If the lamp trips with a known-good element, inspect the intake hose and clamps for a vacuum leak or loose connection sending a false restriction signal.
Manual Section: EngineBucket breakout force drops below rated capacity after extended use, lift feels weak p. 44
Verify the equipment control valve main relief setting on page 44; it must hold 2100 to 2200 psi (143 to 150 bar), since a low setting starves the lift cylinders long before seals become the problem. Rated lift capacity to full height is 1600 pounds (726 kg) per page 45; if cylinders sag well under that, pull and inspect the seals for scoring.
Manual Section: GeneralHydraulic filter condition indicator lights up frequently, requiring filter changes every 25 hours p. 788
Check the hydraulic oil pressure warning circuit on page 676; the lamp lights any time pressure falls below 70 psi (482 kPa), which often points to a clogged filter screen instead of a failing pump. Run the charge pressure test on page 788 and confirm charge pressure holds above 150 psi (1034 kPa) before swapping the spin-on cartridge again.
Manual Section: Power TrainFrequently Asked Questions
What are the replacement specifications for Hydraulic filter (spin-on cartridge)?
The hydraulic filter should be changed after every 500 hours of operation or if the warning lamp for the hydraulic filter illuminates. The hydraulic reservoir uses SAE 10W30 engine oil with additive, and when changing the oil, one U.S. quart of Case HTO (Hydrostatic Transmission Oil Additive) Case part number B17508 should be added.
What are the replacement specifications for Air filter (Dry type, 1 element)?
The air cleaner type is Dry Paper. The element must be cleaned or replaced when the warning lamp for the air cleaner is illuminated while the engine is running. The dust cup should be cleaned after every 10 hours of operation or daily, whichever occurs first.
How do you fix hydraulic system loses charge pressure or lifts slowly under load?
Run the hydraulic system charge pressure test on page 788. With the engine at full throttle, charge pressure must read at least 150 psi (1034 kPa) with no load and 100 psi (690 kPa) under load; below that, inspect the charge pump and relief valve parts for damage.
How do you fix engine overheats or loses power during operation, temperature warning lamp stays on?
Check the temperature warning lamp circuit on page 676; it only illuminates once engine temperature exceeds 212°F (110°C), confirming an actual overheat rather than a sensor fault. Verify coolant level, clean debris from the radiator fins, and check fan belt tension before assuming the 25 hp (18.6 kW) engine at 2800 rpm is underperforming.
How will I receive this Service Manual?
You get a 958-page searchable PDF that downloads instantly after checkout. Open it on your laptop, tablet, or phone, and bring it right to the shop floor.
Can I print this manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Can I find hydraulic circuit diagrams in this manual?
Included. Hydraulic system schematics cover all circuits, control valves, and component specifications.
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