Part of the Case Repair Manuals.
Hunting for a Drott 80 service manual PDF that actually came from the factory? This 106-page manual (OEM #S406162) covers the Drott 80 and 80 CRUZ-AIR excavators from the swing mechanism to the planetary drive axle. Inside you get wiring harness diagrams, upper and lower hydraulic schematics, exploded views of major assemblies, and a troubleshooting section that walks the pumps, control valves, swing circuit, and steering one fault at a time. Scheduled maintenance charts, Maxibrake air system service, and torque tables for grade five and eight capscrews round it out. Torque the planetary wheel hub nuts to 450-500 ft./lbs. and hold the center post to no more than 12 ft./lbs. Your Drott is older than most mechanics working on it; forum guesses won't cut it. Bookmarked PDF that opens on any device, so bring your tablet to the machine and start wrenching.
What's Inside This Drott 80, 80 CRUZ-AIR Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 7-10 | Warranty, Nomenclature, Parts and Service Information, Identification Plate |
| Scheduled Maintenace | 11-24 | - |
| Electrical | 25-32 | Charging Circuit, Circuit Protector, Collector Ring, Wiring Harnesses, Micro Switches, Solenoids |
| Drive Controls and Drive Lines | 33-46 | General, Trouble Shooting Shift Linkage, Transmission - Forward-Reverse, Torque Converter, Single Reduction Drive Unit, Planetary Drive Axle |
| Engine and Throttle Linkage | 47-50 | RPM Specifications, Accelerator Linkage Adjustment, Bleeding Accelerator Hydraulic System |
| Swing Mechanism | 51-54 | Swing Brake, Swing Reducer, Swing Reducer Mounting Plate |
| Air System | 55-64 | Maxibrake Service and Maintenance, Air Reservoir, Check Valves |
| Hydraulic System | 65-102 | General, Reservoir, Pumps, Orbitrol, Center Swivel, Control Valves, Load-Hold Check Valves, Relief Valves |
| Torque Charts | 103-106 | Grade Five and Eight or Better Capscrews, Swivel Fittings |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Planetary Wheel Hubs nut torque | 450-500 ft./lbs. | p. 20 |
| Center post torque | 12 ft./lbs. | p. 23 |
| Engine air cleaner replacement interval | 500 hours | p. 21 |
| Battery voltage | 12 volts | p. 24 |
| Battery maintenance interval | 50 hours | p. 24 |
| Recommended Tire Pressure | 55 psi | p. 24 |
| Transmission Clutch Oil Pressure | 240-280 PSI | p. 37 |
| GMC 8V-53 Stall Speed | 2000 RPM | p. 35 |
| Cummins 8V-785 Stall Speed | 2100 RPM | p. 35 |
Drott 80, 80 CRUZ-AIR Common Problems This Manual Covers
Drott 80 hydraulic system slow and weak, pump cavitation noise, boom and bucket barely move under load
Check reservoir oil level first, then inspect the suction line for loose fittings that pull air and cause cavitation noise. Work through the hydraulic troubleshooting procedures starting on page 65. Tighten weeping JIC swivel fittings to the chart on page 104; the largest 2-1/2 inch nuts take a maximum of 500 ft-lbs.
Manual Section: Hydraulic System p. 65Engine cranks slowly or won't turn over at all after machine sits overnight
Test each 12 volt battery individually; one weak battery drags the whole bank down. Check electrolyte level in every cell, a job the schedule calls for weekly or every 50 hours. Inspect the charging circuit connections and wiring harnesses covered in the Electrical section starting on page 25.
Manual Section: Electrical p. 25Upper structure swing drifts under load, chatters through the arc, or won't swing
Check swing brake adjustment and swing reducer oil level using the procedures that start on page 51. Inspect the swing reducer mounting plate for loose hardware. Verify the center post is torqued to no more than 12 ft./lbs. as shown on page 23; an overtightened post makes the swing bind and chatter.
Manual Section: Swing Mechanism p. 51Engine overheats and loses power during long digging cycles in hot weather
Clean debris from the radiator core and check coolant level before anything else. Service the engine air cleaner; replace the element at the 500 hour interval on the maintenance schedule on page 21. Verify the throttle linkage reaches full travel using the adjustment procedure starting on page 47.
Manual Section: Scheduled Maintenace p. 21Transmission won't shift from high to low range, forward and reverse feel dead
Inspect the shift linkage for binding and misadjustment using the troubleshooting procedures on page 34. Test transmission clutch oil pressure with a gauge; it should read between 240 and 280 PSI, spec on page 37. If pressure is low, look at the forward-reverse transmission before condemning the torque converter.
Manual Section: Shift Linkage Troubleshooting p. 34Frequently Asked Questions
How do I troubleshoot hydraulic problems on a Drott 80?
To isolate a hydraulic problem, use the process of elimination by switching pump output lines. If the malfunction switches to another function, the pump is likely at fault. Check system relief pressure at full RPM and idle; if the difference between the two readings is greater than 25%, the pump is not passing full oil volume and should be overhauled. p. 88
How do I fix steering issues on a Drott 80?
If there is no steering, first check if the Flow Divider valve is functioning. If the poppet is dirty, remove and clean it; if the spring is broken, replace it. Further troubleshooting steps include checking the Steering Orbitrol, inspecting for broken hydraulic lines, or checking for trouble in the torque converter pump linkage. p. 85
What are the replacement specifications for hydraulic filters?
The 33 Micron Paper Filter must be replaced and the 100 Mesh Screen Filters cleaned every two months or 500 hours, whichever comes first, or when the hydraulic system is drained and cleaned. When reassembling, torque the center post to no more than 12 ft/lbs. p. 22
What is the torque specification for the planetary hub lug nuts?
The torque specification for the planetary hub lug nuts is 450-500 ft/lbs. After reaching this torque, relax the nuts to 150 ft/lbs and then retorque to 450-500 ft/lbs in the specified sequence. p. 20
What is the recommended tire pressure for the Drott 80?
The recommended tire pressure for the Drott 80 is 55 psi for the 26.5 X 25 tires. p. 24
What do I get after purchasing this Drott 80 manual?
This is a 106-page scanned PDF ready for immediate download. Works on any device, so pull it up on your phone while you're under the hood. No shipping, no waiting.
Can I print a copy of this Drott 80 Service Manual for the shop?
Yes. The PDF has no DRM restrictions, so print any page or section you need for your shop. Works with any standard printer.
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