Part of the Case Repair Manuals.
Auger drive motor leaking down mid season, and your picker is parked. The Case CPX620 service manual PDF answers that job: 620 pages published under OEM number 6-16630 for this cotton picker. Hydraulic schematics trace the manifold valve and drum lift circuits from pump to cylinder, and wiring diagrams follow every solenoid run back to its connector. Troubleshooting charts and a long stretch of exploded views take the auger motor down to end cover, gerotor, spacer plate and thrust bearing, then build it back in order. Check the drum lift auto solenoid coils for 4.3 ohm at 10 volt; torque the steering cylinder hydraulic lines to 27 to 34 Nm (20 to 25 lb. ft.). Grade 5 hardware runs 108 to 132 pound-inches at 1/4 inch. Cotton does not wait while you hunt for a spec. Bookmarked and searchable, it prints clean enough to live on the bench and get dirty.
What's Inside This Case CPX620 Manual
| System | Pages | Key Topics |
|---|---|---|
| Auger Drive Motor Disassembly | 608 | |
| Auger Motor Assembly | 609-614 | Disassembly Procedures, Inspection Procedures, Assembly Procedures |
| Hydraulic Oil Filters | 615 | Manifold Valve Inline Filter |
| Hydraulic System Air Removal | 616-620 | Filter Maintenance, Manifold Valve Filter |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Grade 5 Bolts, 1/4 inch | 108 to 132 Pound-Inches | p. 9 |
| Grade 5 Bolts, 5/16 inch | 204 to 252 Pound-Inches | p. 9 |
| Drum lift auto solenoids (2) and (8) coil resistance | 10 volt, 4.3 ohm | p. 82 |
| Remaining solenoid coil resistance | 12 volt, 7.5 ohm | p. 82 |
| Steering Cylinder Hydraulic Lines | 27 to 34 Nm (20 to 25 lb. ft.) | p. 200 |
| Differential Rolling Torque | 40 to 80 lb inch (4.5 to 9 Nm) | p. 264 |
| Free running clearance of brake discs | 3.75 to 4.25 mm | p. 339 |
| Engine Oil Capacity (With Filter Change) | 22 U.S. Quarts (21 Litres) | p. 17 |
| Fuel Tank Capacity | 150 U.S. Gallons (567 Litres) | p. 17 |
| Hydraulic Reservoir Capacity | 10 U.S. Gallons (38 Litres) | p. 17 |
| Grade 8 Bolt Torque (1/2 inch) | 110 to 132 Pound-Feet | p. 9 |
| Steering Cylinder Bore | 82.55 mm (3.25 inch) | p. 200 |
Case CPX620 Common Problems This Manual Covers
Case CPX620 hydraulic leak at fittings, low pressure, drum and basket functions slow or dead
Drain and inspect the 10 U.S. Gallon (38 Litre) reservoir before chasing the leak. Replace hardened O-rings at every suspect coupling, then torque 7/16 inch plugs to 9 to 16 Nm and 7/8 inch valves to 57 to 65 Nm per the fitting chart on page 376. Bleed trapped air afterward using the procedure starting on page 616.
Manual Section: Hydraulic System Troubleshooting p. 376Doffer assembly chattering, uneven picking, cotton wrapping the spindles instead of separating clean
Pull the doffer column and spin each bearing cage by hand. Any roughness or axial play means replace the bearing, not just the doffer. Set differential and drive bearing preload to the 40 to 80 lb inch (4.5 to 9 Nm) rolling torque listed on page 264. Reinstall grade 8 half inch hardware at 110 to 132 pound feet.
Manual Section: Transmission Service p. 264Loss of drive engagement, transmission won't shift, lower shift control feels sloppy or dead
Inspect the shift rail linkage and connector pins first; a green corroded terminal fools more mechanics than a bad transmission. Measure solenoid coil resistance against the 12 volt, 7.5 ohm value on page 82, and torque solenoid coil nuts to 7 to 8 Nm. Check brake disc free running clearance at 3.75 to 4.25 mm before pulling the housing.
Manual Section: Transmission Service p. 82Engine overheats in the field, fan drive slipping or fan speed drops under load
Verify fan engage cylinder stroke and check the manifold valve inline filter on page 615 for packed lint, the number one killer on a picker. Clean the core and screens, then test hydraulic supply pressure to the fan circuit. Confirm engine oil level at the 22 U.S. Quart (21 Litre) fill capacity before blaming the fan drive.
Manual Section: Hydraulic Oil Filters p. 615Dead accessory circuit, intermittent lights or interlock faults, machine shuts down at random
Test the harness for opens, shorts, and high resistance with a meter before replacing parts. Check the wiring diagram and work the troubleshooting procedures. Load test the battery and confirm specific gravity; a weak battery mimics a harness fault. Clean and dielectric grease every connector you separate.
Manual Section: Electrical TroubleshootingBasket won't lift or holds pressure poorly, compactor cycles weak or stalls mid stroke
Remove and inspect the lift cylinder rod seals for scoring. Torque the basket lift master cylinder rod locknut lubricated to 1898 Nm (1400 pound foot) and the compactor cylinder rod nut to 145 to 165 Nm (107 to 122 pound foot) per page 564. Cycle the circuit ten times to purge air, then recheck for drift.
Manual Section: Hydraulic Valves, Cylinders, and Motor Service p. 564Frequently Asked Questions
What is the torque spec for the transmission cover retaining bolts on a Case CPX620 cotton picker?
The transmission cover retaining bolts must be tightened to a torque of 98 to 116 lb inch (11 to 13 Nm). p. 264
What is the correct torque spec for the final drive mounting bolts on a Case CPX620 cotton picker?
The final drive mounting bolts should be tightened to a torque of 450 to 540 lb. ft. (612 to 734 Nm). p. 319
What is the required torque for the conveyor motor through bolts on a Case CPX620 cotton picker?
The conveyor motor through bolts must be tightened to a torque of 271 Nm (200 pound foot). p. 564
What is the specified torque for the compactor cylinder rod nut on a Case CPX620 cotton picker?
The compactor cylinder rod nut must be tightened to a torque of 145 to 165 Nm (107 to 122 pound foot). p. 564
What is the final drive fill capacity on a Case CPX620 cotton picker?
The final drive fill capacity is 7.4 U.S. Quarts (7.3 Litres) of Case Hy-Tran Ultra oil. p. 319
How quickly can I access this Case CPX620 manual after buying?
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