Part of the Case Repair Manuals.
Wrenching on a Case 45? This 314-page Case 45 Cruz-Air Excavator Service Manual PDF (OEM #S406267M1) walks you through the 45 and 45 Cruz-Air excavators, from engine and torque converter to boom, dipperstick, and swing gearbox. Inside: full electrical schematics for both the 12/24 volt and 24 volt machines, hydraulic schematics for excavator and logger units, air system diagrams, and trouble charts that take you from symptom to fix. You also get page after page of cylinder and pump rebuild procedures, hoist and crowd cylinders through the main hydraulic pump. Set the main reliefs to 3000 psi (20 680 kPa) and the steering priority relief to 2000 psi, straight from the factory tables. Your excavator is down and the forums are guessing. This bookmarked PDF opens on any device; carry it to the machine on your tablet and get wrenching.
What's Inside This Case 45, 45 Cruz-Air Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 3-11 | Index, Safety, Introduction, Nomenclature, Description and Specifications |
| Scheduled Preventive Maintenance | 12-20 | Introduction, Hydraulic System Operating Pressures, Capacities, Lubricants and Fluids, Maintenance Chart, List of Grease Fittings |
| Mechanical System | 21-48 | Engine, Torque Converter, Transmission, Axles, Turntable Swing, Boom and Attachments |
| The Air System | 49-58 | Introduction, Air Supply System, Service Brake System, Parking Brake, Outrigger and Fast Hoist Control, Troubleshooting |
| The Electrical System | 59-106 | Introduction, Dual Voltage System, Volt System |
| The Hydraulic System | 107-151 | Introduction, System Maintenance and Troubleshooting, Main Hydraulic System, Power Steering System, Trouble Charts |
| Cleaning Instructions and Accelerator Components | 152-154 | Cleaning Instructions, Accelerator Master Cylinder, Accelerator Slave Cylinder |
| Brake System Components | 155-193 | Brake Actuator, Brake Master Cylinder, Air Brake Control Valve, Air Compressor, Air Relay Valve, Air Solenoid Valve, Air Swivel, Wheel Brakes |
| Boom and Attachments | 194-209 | Boom Repairs, Bucket Removal, Dipperstick Removal, Bushing Replacement, Wrist-O-Twist, Grapple Head |
| Center Swivel and Collector Ring | 210-215 | Center Swivel Disassembly, Collector Ring Maintenance, Collector Ring Installation |
| Drive Shafts and Swing Gearbox | 216-225 | Drive Shaft Removal, Drive Shaft Installation, Swing Gearbox Disassembly, Swing Gearbox Assembly, House Brake |
| Hydraulic Cylinders and Pumps | 226-261 | Hoist Cylinder, Crowd Cylinder, Tool Cylinder, Steering Cylinder, Outrigger Cylinder, Main Hydraulic Pump, Steering Pump, Hydraulic Motor |
| Hydraulic Swivel and Control Valves | 262-271 | Hydraulic Swivel, Main Control Valves, Port Relief Valves, Power Sensing Valve, Steering Diverter Valve, Swing Crossover Relief Valve |
| Torque Converter and Transmission | 272-298 | Torque Converter Removal, Converter Assembly, Converter Housing Assembly, Auxiliary Pump Drive, Transmission Disassembly, Transmission Assembly, Turntable Bearing Replacement |
| Torque Charts and Schematics | 299-314 | Torque Charts, Air Schematic, Electrical Schematic - 12/24 Volt System, Electrical Schematic - 24 Volt System, Hydraulic Schematic - Excavator Units |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Cold Cranking Capacity | 625 amps at 0° F (-18° C) for 30 seconds | p. 11 |
| Main Relief Valve Pressure Setting | 3000 psi (20 680 kPa) | p. 124 |
| Steering Priority Relief Pressure Setting | 2000 psi | p. 13 |
| Outrigger Port Relief Pressure Setting | 800 psi | p. 13 |
| Tire Pressure (Roading) - 17.5 x 25 | 60 psi | p. 11 |
| Tire Pressure (Roading) - 23.0 x 21 | 50 psi | p. 11 |
| Wheel Lug Nut Torque | 400-450 lb-ft | p. 41 |
Case 45, 45 Cruz-Air Common Problems This Manual Covers
Front wheel vibration and wobble at roading speed after tire or brake service
Check wheel lug nut torque before chasing anything inside the axle; torque nuts to 400-450 lb-ft (542-610 Nm) in a crossing pattern, the spec shown on page 41. Set 17.5 x 25 tires to 60 psi (414 kPa) for roading, and recheck lug torque after the first few hours of operation.
Manual Section: Axle Troubleshooting p. 41Turntable swing drifts under load and chatters when starting or stopping a swing
Inspect the swing crossover relief valve first; a worn or stuck cartridge lets the swing motor bleed off and drift. Confirm overall system pressure reaches 3000 psi (20 680 kPa) before adjusting any cartridge, then bleed air from the swing circuit and cycle the swing full travel both directions to verify.
Manual Section: Mechanical System — Turntable Swing / House Brake p. 44Frequently Asked Questions
What are the torque specifications for the wheel lug nuts on the Case 45?
The correct torque for the wheel lug nuts is 400-450 lb-ft (542-610 Nm). When installing the wheel, tighten the nuts in the specified order shown in figure 51, then re-tighten to the same torque value. p. 41
How do you fix case 45 Cruz-Air engine cranks slowly or will not start in cold weather?
Load test the battery before anything else; it must deliver 625 amps at 0 F (-18 C) for 30 seconds. Check electrolyte level and clean both cable connections. If the battery passes, work through the engine troubleshooting chart on page 26 to isolate slow cranking and no-start conditions. p. 26
How do you fix all hydraulic functions slow under load, oil foaming in reservoir, pump noisy?
Check reservoir oil level and tighten every suction line fitting; foaming means the pump is pulling air. Inspect the pump shaft seal for leaks. Then put a gauge on the system and confirm the main reliefs open at 3000 psi (20 680 kPa) as documented on page 124. A low relief setting slows every circuit. p. 124
How do you fix hard steering at low engine rpm and slow wheel response in either direction?
Test steering pressure with a gauge in the priority circuit; the steering priority relief should hold 2000 psi (13 800 kPa) per the setting listed on page 13. If pressure is low, adjust or replace the relief cartridge. Inspect the steering cylinder for internal bypass before condemning the steering pump. p. 13
Is this Case 45 manual a PDF I download?
Delivery is instant: a 314-page scanned PDF is yours the second checkout clears. Laptop, tablet, or phone, all fine.
Is this Case 45 Cruz-Air Excavator Service Manual printable?
Yes, printing is unrestricted: a single page, a chapter, or the lot, on letter or A4.
Is there a wiring diagram in this Case 45 Cruz-Air Excavator Service Manual?
Yes. Full electrical diagrams are included, along with circuit descriptions and the connector pinouts needed to trace a fault end to end. You can see one on page 301.
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