Part of the Case Repair Manuals.
Looking for a Case 50 service manual PDF that actually came from the factory? This 217-page manual (OEM #S 406236M2) covers the Case 50 crawler excavator from undercarriage to boom tip. Inside: hydraulic schematics with full circuit routing for the summated pump system, wiring diagrams for both the 12/24-volt and later 24-volt machines, and a troubleshooting section that walks the swing, track drive, and pilot control circuits fault by fault. You also get page after page of teardown procedures, from the swing gearbox and track drive motor to the turntable bearing swap. Torque the 3/4-inch turntable capscrews to 360 lb-ft (490 Nm) and set the by-pass check valve at 65 psi (450 kPa). No more chasing hydraulic pressure drops with a gauge and a guess. Bookmarked PDF opens on any device; carry it to the machine on your tablet and start wrenching.
What's Inside This Case 50 Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 5-10 | Safety Precautions, Introduction, Nomenclature and General Description, Specifications |
| Scheduled Preventive Maintenance | 11-23 | Introduction, Hydraulic Oil Recommendations, Hydraulic System Operating Pressures, Component Capacities, Rated Pump Output, Maintenance Chart |
| Mechanical System | 24-44 | Undercarriage, Engine and Related Parts, Turntable Swing, Boom and Attachments |
| Electrical System | 45-64 | Charging and Starting System, Control Circuits, Lights and Instrumentation Circuits, Alternator, Voltage Regulator, Batteries |
| Hydraulic System | 65-99 | Introduction, System Maintenance |
| Troubleshooting | 100-116 | Introduction, Engine, Undercarriage, Electrical System, Pilot Control System, Main Hydraulic System, Track Drive System, Swing System |
| Undercarriage Component Service | 117-130 | Track Chain, Track Adjustment Cylinder, Track Rollers, Idler Wheel, Digging Brake, Final Drive Transmission |
| Engine Drive, Brakes, Swing Gearbox and Turntable | 131-148 | Engine and Pump Drive, House Brake, Swing Gearbox, Turntable Bearing Replacement |
| Boom, Dipperstick and Wiring Harness | 149-150 | Boom, Wiring Harness Replacement |
| Hydraulic Pumps and Control Valves | 150-171 | Main Hydraulic Pump, Pilot Hydraulic Pump, Main Control Valves, Power Sensing Valve, Pilot Control (Modulator) Valves |
| Hydraulic Motors, Swivel, Cylinders and Tank | 172-205 | Track Drive Motor, Swing Motor, Swing Cushion Valve, Leveler Lock Valve, Hydraulic Swivel, Hydraulic Cylinders, Hydraulic Oil Tank, Solenoid Control Valve |
| Torque Charts and Schematics | 206-217 | Capscrew Diameter, Grade 5 Capscrew, Grade 8 Capscrew, Hardened Washer, Jic Swivel Nuts, Electrical Symbols |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Center post torque | 40 lb-ft (54 Nm) | p. 19 |
| Center bolt torque | 75 lb-ft (100 Nm) | p. 20 |
| Minimum cranking voltage | 18 volts | p. 62 |
| By-pass check valve opening pressure | 65 psi (450 kPa) | p. 68 |
| Swing Drifts-control in Neutral pressure | 1550 psi | p. 112 |
| Thrust plate clearance | 1/32 inch (0.8 mm) | p. 183 |
| Pocket seal length | 1/4 inch (63 mm) | p. 189 |
| total inside diameter of swivel housing | 4.253 ± .001 inch (108.03 ± .025mm) | p. 194 |
| chrome plating thickness to a side | .002 inch (.050mm) | p. 194 |
| Engine Cooling System Capacity | 32 L | p. 13 |
| Fuel Tank Capacity | 284 L | p. 13 |
| Hydraulic System Capacity | 246 L | p. 13 |
Case 50 Common Problems This Manual Covers
Case 50 crawler excavator engine won't crank, batteries run down after sitting overnight
Check cranking voltage first: crank the engine and watch the voltmeter, it must hold at least 18 volts during the load test on page 62. Below that, clean and tighten battery cables, then load test each battery separately. If voltage holds but the starter drags, trace the starter circuit using the wiring diagram on page 209.
Manual Section: 24 Volt Electrical System Troubleshooting p. 62Engine hard to start after sitting, stalls or loses power under load
Check for fuel restriction before blaming the injection pump. Replace the fuel filter, then bleed air from the system until fuel runs solid at the pump with no bubbles. Confirm the tank actually has fuel; it holds 75 gallons (284 L) and gauges lie. Work through the engine troubleshooting procedure on page 102 if it still stalls hot.
Manual Section: Engine Troubleshooting p. 102All hydraulic functions slow and weak, oil foaming in the tank when warm
Check hydraulic oil level on the sight gauge first; the system holds 65 gallons (246 L), and running low pulls air in and foams the oil. Tighten every suction line fitting between tank and pump. Then test main relief pressure; it should hold 3300 psi (22 700 kPa) per page 79. Reset or repair the relief if it comes in low.
Manual Section: Main Hydraulic System Troubleshooting p. 79Track jumps the drive sprocket and travel is noisy over rough ground
Clean packed mud out of the undercarriage first; mud packing mimics a tension problem. Check track tension at the adjustment cylinder covered on page 118 and grease until sag is correct. Inspect rollers and idler wheels for leaking seal groups, pages 119 and 121. If travel stays noisy, drain each final drive and refill with 13.2 L of HD80-90 gearlube.
Manual Section: Undercarriage Troubleshooting p. 102Engine runs hot in summer, coolant temperature keeps climbing during heavy digging cycles
Blow out the radiator fins from the fan side; dirt blockage is the usual culprit. Check coolant level cold and top up with a 50/50 antifreeze and water mix; the system holds 32 L. If the hydraulic oil also runs hot, suspect a plugged oil cooler; its by-pass check valve opens at 65 psi (450 kPa), covered on page 68.
Manual Section: Engine Troubleshooting p. 102Upperstructure swings past the mark and drifts when the control is in neutral
Check the swing cushion valve relief pressure first; it should hold 1550 psi, and a low setting lets the house drift in neutral. Page 112 walks through the check. Re-set or replace the relief cartridge in the cushion valve, serviced on page 191. Inspect the house brake discs for wear if drift continues with the brake applied.
Manual Section: Swing System Troubleshooting p. 112Frequently Asked Questions
What are the torque specifications for the turntable capscrews?
The turntable capscrews must be torqued to 360 lb-ft (490 Nm) when using the torque wrench only, or 220 lb-ft (300 Nm) when using a horizontal extension. These values apply to 3/4 inch thread diameter capscrews with Loctite TL-242 applied. p. 40
How do I troubleshoot starting problems on a Case 50?
To troubleshoot starting problems, first check battery condition and clean terminals. If the starter fails to turn the engine, check for voltage at the BAT terminal of the Key Switch (Wire No. 1K) and ensure the starter relay is functioning properly as described on page 61. p. 61
What are the replacement specifications for the fuel filter?
The engine fuel filters should be drained daily to remove water and sediment. For specific replacement intervals and procedures, refer to the separate engine manufacturer's manual supplied with the machine. p. 18
What is the capacity of the hydraulic oil tank?
The hydraulic oil tank has a capacity of 25 gallons (95 liters). p. 13
What is the correct torque for the track pad bolts?
The track pad bolts should be tightened to 173-195 lb-ft (235-265 Nm) during assembly. p. 120
Is this Case 50 manual a PDF I download?
You get a 217-page scanned 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 a copy of this Case 50 Service Manual for the shop?
No restrictions at all. Print individual pages, full chapters, or the entire manual. The PDF is completely unlocked.
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