Description

Scania RB660 1997 Service Manual – Axle Reduction (Bevel Gear) Factory Specs

You’ve got a Scania RB660 with an oil leak at the axle reduction command unit, and the manual you’re using is a faded copy that omits half the steps. That’s a ticket to a redo. The factory Scania RB660 1997 Service Manual is 98 pages of exactly what the line at Scania AB published—no aftermarket guesswork, no missing torque values. This is the original document, part number 1xa0710xa0602, covering the bevel gear (grupo cónico) and the entire differential assembly for truck and bogie axles.

Axle Reduction and Differential Rebuild Procedures

Starts with an exploded view on page 6 so you see how everything nests before you pull a single bolt. Then it walks through localized repairs: oil leaks at the differential command unit (page 18), seal replacements on the primary and secondary shafts (pages 25 and 28), and complete overhaul of the differential carrier (page 41). The reconditioning section—20 pages—covers removal, bearing race replacement, pinion height adjustment, and preload shimming. Every step is written for the tech holding the wrench, not the engineer sitting at a desk.

98 Pages of Factory Specifications

Page 94 is where you’ll find the torque tables (binários de aperto) for every fastener in the axle reduction. Need the pinion bearing preload? It’s listed there with the correct values in Nm and lbf·ft. The manual also includes check measurements, adjustable dimensions, and oil capacities. Missing a spec means stripped threads or a howling diff—this kills that risk.

What Special Tools Does This Manual Cover?

Pages 10 and 96-98 list the special tools for the pinion yoke (terminal/forquilha) and the pinion itself. You’ll see part numbers, descriptions, and where to apply them. If you don’t own the Scania puller set, the manual tells you which universal tools can substitute and which cannot. Ignoring that list will cost you an afternoon of fighting a stuck bearing.

Oil Leaks: Localized Repair Steps from the Manual

Section “Reparos localizados” starts on page 14 with screen filter cleaning and oil filter change. Then it zeroes in on oil/air leaks at the differential command unit (page 18) and the bogie differential command unit (page 22). Each procedure lists the seals, the order of disassembly, and the re-installation torque. No guesswork—just follow the sequence.

Get the Right Torque Data for the Bevel Gear

Preload adjustment of the pinion bearings (page 64) and gear backlash (page 81) are the two most critical adjustments in any Scania axle. The manual gives you the exact shim thickness ranges and the order to check contact pattern (page 84). If you’ve ever had a pinion bearing fail at 50,000 miles because the preload was off, you’ll appreciate having the factory procedure in front of you.

Long paragraph: This manual is written in Portuguese (original Scania Sweden content), but the diagrams and numerical specs cross any language barrier. The exploded view alone saves you hours of head-scratching—page 6 shows every shim, bearing race, and seal in the reduction box. When you’re rebuilding the differential (page 41), you’ll reference the oil pump removal on page 46 and the bogie clutch pack on page 48. Every page is a direct copy of what Scania handed to its dealership techs in 1997. No reprints.

Short fragment: Torque specs you can trust.

If you’re also working on the transmission, the Manual Transmission requires separate specs—this manual only covers the axle reduction. For the Bosch ABS system on the CP12 chassis, check Scania CP12 1997 Service Manual – Bosch ABS/TC Diagnostic Specs. And for gearbox overhaul, see Scania GR900 1997 Service Manual – Factory Gearbox Specs. The R780 axle reduction shares some hardware—Scania R780 Axle Reduction (Bevel Gear) Service is a companion document.

Another external reference: Manual Transmission fundamentals are covered elsewhere, but for the Scania RB660 differential, this is the only source that matters.

Does this manual cover the RB660 bogie differential?

Yes. Pages 48–54 cover the bogie differential command unit removal and overhaul.

What kind of torque specs are included for the pinion bearing preload?

Page 64 details the step-by-step preload adjustment using a special tool (listed on page 96) and gives the required rotational torque in Nm. The spec is reached by shimming the bearing races under the pinion head. Page 94 then lists all fastener torques for the pinion nut, differential housing bolts, and ring gear bolts. Without these numbers, you risk bearing failure or gear noise within 10,000 miles. The factory spec accounts for the actual roller bearing drag, so you measure rotational torque after installing the oil seal—something third-party manuals often skip.

This is the document your shop needs on the bench. Don’t trust a digital copy that’s been scanned and cropped. The factory manual—98 pages, 1997 original—gives you the same data Scania engineers wrote. Access the Factory Manual now from AutoRepairManuals and get the axle reduction right the first time.