All 199 pages of this Drott 40 Cruz-Air Series "B" Service Manual (OEM #S-406179M1) are factory documentation for one machine: the Series B mobile excavator. Inside, you get a full scheduled maintenance section with service charts, lubrication fitting layouts, and component fluid capacities, plus dedicated troubleshooting procedures covering the mechanical, air, electrical, and hydraulic systems. Open to the schematics section and you'll find wiring coverage for charging, control, and instrument circuits; hydraulic diagrams spanning main pump through swing, hoist, and auxiliary circuits; and a torque chart section with JIC swivel nut values. Service your air cleaner every 100 hours or two weeks; torque differential bearing cap capscrews to 116-129 lb-ft on 9/16" 12-thread hardware. Your machine is down. Search by keyword, jump to any section, and walk out to the excavator with the right number in hand.
What's Inside This Drott 40 Cruz-Air Series "B", Drott 40 Cruz-Air Series "B" Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 4-7 | Safety Precautions, Nomenclature, Introduction, Directional Reference, Parts and Service |
| Scheduled Preventive Maintenance | 8-15 | Introduction, Lubricant and Fluid Recommendations, Component Capacities, Hydraulic System Operating Pressures, Preventive Maintenance Schedule, Service Chart |
| The Mechanical System | 16-95 | - |
| The Air System | 96-113 | Maintenance and Troubleshooting, Disassembly and Repair of System Components |
| The Electrical System | 114-129 | Maintenance and Troubleshooting (Introduction, Charging Circuit, Control Circuits, Lights and Instrument Circuits, Collector Ring) |
| The Hydraulic System | 130-186 | - |
| Torque Charts and Schematics | 187-199 | Recommended Torque Values, Jic Swivel Nut Torque Values, Air Schematic, Electrical Schematic, Hydraulic Schematic, Graphic Symbols |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Pinion Bearing Cage to Carrier Capscrews torque | 3/8" 16 THDS: 30-40 lb-ft (40-54 Nm); 7/16" 14 THDS: 50-65 lb-ft (68-88 Nm); 1/2" 13 THDS: 80-105 lb-ft (108-142 Nm); 5/8" 11 THDS: 130-170 lb-ft (176-230 Nm) | p. 65 |
| Differential Bearing Cap to Carrier Capscrews torque | 9/16" 12 THDS: 116-129 lb-ft (157-175 Nm); 5/8" 11 THDS: 160-180 lb-ft (217-244 Nm); 3/4" 10 THDS: 290-320 lb-ft (393-434 Nm); 7/8" 14 THDS: 375-415 lb-ft (508-562 Nm); 7/8" 9 THDS: 470-520 lb-ft (637-705 Nm) | p. 65 |
| Battery type and capacity | Two 12 volt, 90 amp, 78 plate Batteries, connected in parallel | p. 115 |
| Battery electrolyte specific gravity (fully charged) | 1.260 to 1.265 corrected to 80° F. (26.6° C.) | p. 117 |
| Air cleaner element cleaning/replacement interval | Every 2 weeks or 100 hours clean or replace element; replace after every 5 cleanings | p. 12 |
| Air cleaner element cleaning air pressure | Nozzle pressure should not exceed 100 psi (690 kPa) | p. 18 |
| General seal replacement | Replace all parts found defective, plus all "o" rings, gaskets and seals | p. 52 |
| Engine overheating possible causes | Insufficient coolant or dirty fins, Defective thermostat, Insufficient lubricating oil | p. 21 |
| Hydraulic oil overheating possible causes | Repeated by-passing of oil through relief valve due to improper operation, Clogged oil screens, Too light an oil, Oil level too low, Lines to cooler plugged, Dirty oil | p. 145 |
| Axle bearings wear causing noise/vibration | Replace item found defective | p. 37 |
| Torque Converter & Revers-O-Matic worn bearings causing noise/vibration | Replace | p. 28 |
| Engine Crankcase Capacity | 12 qts. (11.4L) | p. 9 |
Drott 40 Cruz-Air Series "B", Drott 40 Cruz-Air Series "B" Common Problems This Manual Covers
Drott 40 Cruz-Air Series B transmission will not shift forward or reverse, machine won't move
Check the electrical control circuits for corroded or broken connections throughout the control harness. Verify the transmission shift selector linkage moves freely. Inspect both 12-volt, 90-amp, 78-plate batteries (connected in parallel per page 115) for adequate state of charge; low voltage is a primary cause of shift failure in aging control wiring.
Manual Section: Electrical Control Circuits TroubleshootingEngine won't crank or turns over too slowly to fire in cold weather p. 117
Check electrolyte specific gravity in both batteries; a fully charged cell reads 1.260 to 1.265 corrected to 80°F (26.6°C) per page 117. If gravity is low, charge or replace the battery. Verify starter motor connections are tight and corrosion-free. Inspect ignition wiring from key switch through to the starter solenoid before pulling the starter.
Manual Section: The Electrical SystemEngine overheats or blows white smoke at operating temperature, coolant or oil smell present p. 21
Remove and inspect the air cleaner element; service every 100 hours and replace after every 5 cleanings per page 12. Never blow clean with air pressure above 100 psi (690 kPa). Check coolant level and clear packed debris from cooling fins. Verify crankcase holds a full 12 qts. (11.4L); insufficient oil is a confirmed overheating cause on this machine.
Manual Section: Engine TroubleshootingDrive sprocket bearing grinding or vibration with loss of power under load p. 65
Inspect both inner and outer drive sprocket pillow block bearings for play, heat discoloration, or rough rotation. Replace any defective bearing completely. When reassembling, torque differential bearing cap capscrews per page 65: 5/8" 11 THDS to 160-180 lb-ft (217-244 Nm). If noise continues after bearing replacement, check the torque converter for worn bearings.
Manual Section: Axles TroubleshootingMain hydraulic crowd, hoist, or turntable swing moves slowly or not at all p. 145
Check hydraulic oil level first; the complete system holds 35 gal. (132L) per page 9, and low level is a direct cause of slow or no motion. Inspect and clean all oil screens. Verify main relief pressure is set to 2050 psi (14100 kPa). If pressure reads low, check for sticking valve spools or repeated pump bypass per page 145.
Manual Section: Main Hydraulic System TroubleshootingBucket pins and bushings worn, visible fluid weeping at crowd or hoist cylinder joints p. 52
Remove bucket pins and inspect bushings for wear and scoring. Replace all defective parts, plus every O-ring, gasket, and seal in the assembly per page 52. Grease boom and bucket pin fittings at every 10-hour service interval. If crowd or hoist cylinder seals are weeping, replace the full seal kit, not just the visible leak point.
Manual Section: Cylinder Circuits TroubleshootingFrequently Asked Questions
How do you fix drott 40 Cruz-Air Series B transmission will not shift forward or reverse, machine won't move?
Check the electrical control circuits for corroded or broken connections throughout the control harness. Verify the transmission shift selector linkage moves freely. Inspect both 12-volt, 90-amp, 78-plate batteries (connected in parallel per page 115) for adequate state of charge; low voltage is a primary cause of shift failure in aging control wiring.
How do you fix engine won't crank or turns over too slowly to fire in cold weather?
Check electrolyte specific gravity in both batteries; a fully charged cell reads 1.260 to 1.265 corrected to 80°F (26.6°C) per page 117. If gravity is low, charge or replace the battery. Verify starter motor connections are tight and corrosion-free. Inspect ignition wiring from key switch through to the starter solenoid before pulling the starter.
How do you fix engine overheats or blows white smoke at operating temperature, coolant or oil smell present?
Remove and inspect the air cleaner element; service every 100 hours and replace after every 5 cleanings per page 12. Never blow clean with air pressure above 100 psi (690 kPa). Check coolant level and clear packed debris from cooling fins. Verify crankcase holds a full 12 qts. (11.4L); insufficient oil is a confirmed overheating cause on this machine.
What format is this manual in?
Instant PDF download. You get the full 199-page searchable Service Manual immediately after payment. Open it on your laptop, tablet, or phone right in the shop.
Can I print this manual?
The PDF is DRM-free. Print whatever sections you need to take out to the shop. Standard letter or A4 paper works.
Are hydraulic system diagrams in this Drott 40 Cruz-Air Series "B" manual?
Yes, complete hydraulic schematics with flow diagrams, valve configurations, and pressure specifications are included.
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