Mack RB 688 S
Built: 1990-1990 · Series: Other models
More machines from model year 1990
Not the right version? The data comes from vehicle registers holding many near-identical versions side by side. Photograph the data plate — we read make and type from it. Open the scanner e-mail address required
Mack – further truck models: collective page for the US brand outside the named series, from the B and R models through CH and Granite to TerraPro, five- to eight-cylinder engines, gross weights up to 28.5 tonnes
This page gathers trucks from the US brand Mack that the register could not assign to a named series – from 1950s-to-1970s classics such as the B-61 and LTL, through the R and CH series, to newer models like Granite, Pinnacle and TerraPro. Mack was founded in 1900 in Brooklyn, later moved production to Allentown, Pennsylvania, and has belonged to the Volvo Group since AB Volvo's 2001 acquisition; the bulldog hood ornament has been the brand's mark since the 1930s. The model codes usually denote series and axle configuration, with R and CH covering long-haul tractor units and Granite and TerraPro covering construction and waste-collection vehicles.
Read on 3 more paragraphs
The register lists 81 versions here with five- to eight-cylinder engines, displacements up to 17.0 litres, kerb weights up to around 19.5 t at gross vehicle weights of 4,804 to 28,500 kg, lengths of 5,530 to 12,000 mm and widths of 2,240 to 2,900 mm.
Mack has been a fixture in North American long-haul transport, construction and waste management for over a century, competing there chiefly with Kenworth, Peterbilt, Freightliner and International; outside North America the brand is far less common, which affects parts sourcing and workshop availability.
On classic B, R and LTL models, check frame corrosion, the condition of leaf springs and drum brakes, and the originality of engine and gearbox; on the newer CH, Granite and TerraPro model years, check the turbocharger, exhaust after-treatment and wear on the automated manual gearboxes. Parts for current series run through the Mack dealer network, while historic models are sourced through specialist American classic-truck dealers.
Sources: Kennwerte der Modelle Mack (weitere Modelle), Mack Trucks (Hersteller)
Technical data
Engine
| Cylinders | 6correct |
|---|
Dimensions and weights
| Width | 2,520 mmcorrect |
|---|---|
| Wheelbase | 5,260 mmcorrect |
| Unladen weight | 8,040 kgcorrect |
| Gross vehicle weight | 25,500 kgcorrect |
Drivetrain and chassis
| Wheels | 6correct |
|---|
Frequently asked questions
How much does the Mack RB 688 S weigh?
The unladen weight is 8,040 kg.
What is the gross vehicle weight of the Mack RB 688 S?
25,500 kg.
What engine does the Mack RB 688 S have?
6 cylinders.
When was the Mack RB 688 S built?
Production years: 1990.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Ask about parts availability for this build year — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
We do not sell machines. We ask the dealers who carry this model and come back with price and lead time.
Request a quote →
We ask the suppliers and come back with price and lead time.
Request spare parts →
This page carries 8 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
The technical data on this page comes from official vehicle registration records (RDW/Traficom), not from the manufacturer.
Missing a figure you were looking for? Report it →
Know this machine better? Have a photo, a manual, or know that a figure is wrong? Add it to the register →
Other models in this series
Sources: [1]
Truck in 3D section
Turn the model, look inside and click an assembly — each one is explained.