Part of the Case Repair Manuals.
Starter won't turn, or the loader valve spools stop returning to neutral and cycle times drag. On a Case 1845B Uni-Loader, you find the cause with a troubleshooting chart, a pressure gauge or a flow test. This service manual covers both the 188 Diesel and the 159 spark ignition engine.
The drive is traced from the hydrostatic piston pump through the motor, sprockets and chains, planetaries and axle housings. Hydraulics get relief pressure checks, flow tests for each circuit, and the loader, auxiliary and backhoe control valves. Wiring diagrams cover the diesel and gasoline machines.
Keep it on a phone or a shop laptop. It goes with you to the bench, the truck or the jobsite where the loader sits.
What's Inside This Case 1845B Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 1-42 | Safety Rules, Service Manual Introduction, Torque Specifications, Maintenance and Lubrication |
| Engines | 43-466 | 188 Diesel Engine Specifications, 159 Spark Ignition Engine Specifications, Engine Removal and Installation, Engine Diagnosis and Tune-Up, Engine Lubrication |
| Fuel System | 467-546 | Fuel Injection Pump, Fuel Injectors, Fuel Filters, Carburetor, Hand Primer Pump |
| Electrical | 547-660 | Electrical System Troubleshooting, Wiring Diagrams, Battery, Starter, Alternator, Distributor Ignition System |
| Power Train | 661-924 | Hydrostatic System, Piston Pump, Hydrostatic Motor, Drive Sprockets and Chains, Wheels and Tires |
| Brakes | 925-928 | Parking Latch |
| Hydraulics | 929-1123 | Hydraulic System Troubleshooting, Loader Control Valve, Auxiliary Control Valve, Backhoe Control Valve, Cylinders |
| Mounted Equipment/Chassis | 1124-1206 | Loader, Backhoe, ROPS Canopy, Operators Seat, Decals and Painting |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Diesel engine | 188 Diesel, 188 cubic inches | p. 16 |
| Spark ignition engine | 159 Spark Ignition, 159 cubic inches | p. 30 |
| Rated engine speed (diesel) | 2200 RPM | p. 16 |
| Rated engine speed (spark ignition) | 2200 RPM | p. 30 |
| Equipment pump output | 14.8 U.S. gallons at 2000 psi at 2000 rpm | p. 930 |
| Loader main relief valve | 2275 to 2375 psi at full throttle | p. 930 |
| Hydraulic reservoir capacity | 13 U.S. gal | p. 930 |
| Engine crankcase oil, without filter change | 6 quarts (5.7 litres) | p. 12 |
| Engine crankcase oil, with filter change | 7 quarts (6.6 litres) | p. 12 |
| Cooling system capacity | 16 quarts (15 litres) | p. 12 |
| Fuel tank capacity | 19.5 gallons (74 litres) | p. 12 |
| Chain compartment oil (each) | 5 U.S. quarts (4.7 litres) engine oil | p. 784 |
| Planetary oil (each) | 1 pint (0.5 litre) | p. 12 |
| Battery (diesel) | 12 volt, group 30H, SAE 9H9A | p. 574 |
| Battery (gasoline) | 12 volt, group 24, SAE 9MJ3K | p. 574 |
| Alternator output | 42 amperes at 13 volts | p. 624 |
| Wheel nut torque | 80 to 90 pound-feet | p. 924 |
| Planetary mounting plate nuts | 80 to 100 pound-feet | p. 793 |
Case 1845B Common Problems This Manual Covers
One loader circuit is weak or slow while the others work
Run the flow test circuit by circuit and compare each one to Test No. 1 at the same pressure. If a circuit flows less, it has leakage. Check for worn or damaged cylinder packing, a worn spool or spool bore, or a low circuit relief valve setting.
Manual Section: Hydraulics - Hydraulic Troubleshooting and Flow Tests p. 968Cylinder rod seals leak, spools stick off neutral and the oil runs hot
The manual names contamination as a major cause of hydraulic malfunction. Leaking cylinder rod seals, spools that won't return to neutral, oil running too hot and slow cycle times all trace back to it. Clean the system out with the portable filter before you replace parts.
Manual Section: Hydraulics - Hydraulic Troubleshooting p. 977Drive chains are loose and the adjustment has run out
Tighten the drive chain by moving the planetary mounting plate in its slots. Tighten the driven chain by moving the axle housing in its slots. When the plate or housing has no travel left, replace that chain. Never shorten a chain to take up slack.
Manual Section: Power Train - Drive Sprockets and Chains p. 784Starter does not run when the key is turned
Work through the electrical troubleshooting chart in order. Check for discharged batteries, then bad connections or wires in the starting circuit. Then look at engine oil too heavy for cold weather, a worn pinion or flywheel ring gear, loose starter cap screws and the starter solenoid.
Manual Section: Electrical - Electrical Troubleshooting Chart and Starter p. 549Frequently Asked Questions
What oil goes in the 1845B chain case, and how often should it be changed?
Each chain compartment takes 5 U.S. quarts (4.7 litres) of engine oil, not hydraulic fluid. At 500 hours or once a year, drain the chain compartments and flush them with diesel fuel before refilling. The Power Train section covers the drive sprockets and chains. p. 784
How do I check the loader main relief pressure?
Connect a 0 to 3000 psi gauge, run the engine at full throttle, hold the control lever and read the gauge. The loader main relief should read 2275 to 2375 psi. Equipment pump output is listed at 14.8 U.S. gallons at 2000 psi at 2000 rpm. p. 971
The starter won't turn the engine over. Where do I start?
The electrical troubleshooting chart lists discharged batteries and bad connections or wires in the starting circuit first. After that come wrong engine oil for cold weather, a worn starter pinion or flywheel ring gear, loose starter cap screws and a damaged solenoid. If you jump it, the booster batteries must total 12 volts. p. 549
My gas 1845B backfires through the carburetor and stalls under load. What's wrong?
On the 159 spark ignition engine, backfiring through the carburetor, loss of power or stalling under load means the load mixture setting is too lean. The Fuel System section covers the carburetor along with the diesel injection pump, injectors and filters. p. 542
