Volvo FH Belt Tensioner: Dayco APV1151 for D11 and D13 Engines

Last updated: 21 October 2026 · Scantruck Engineering Pte Ltd, Singapore

A squealing belt on a Volvo FH is easy to ignore. A roadside breakdown and a lost delivery slot are not. The Dayco Volvo FH belt tensioner is APV1151. It fits Volvo FH, FM and FMX trucks with D11 and D13 engines, and cross-references to Volvo OE numbers 20739751, 20935521, 21422765, 3979979 and 85013020. Pair it with the Dayco 10PK1342SHD Poly-V belt. Confirm fitment with Scantruck Engineering Pte Ltd, Singapore before you order.

This guide is for anyone running Volvo FH or FM trucks in Singapore or elsewhere in ASEAN. It shows what the part does, which OE numbers it replaces, and how to avoid a repeat breakdown.

Which Dayco tensioner fits a Volvo FH D13?

Dayco APV1151 is the belt tensioner for the accessory drive on Volvo FH, FM and FMX trucks with D11 and D13 engines. It is also listed for the equivalent Renault Trucks models.

Detail	Dayco APV1151
Part type	Belt tensioner (spring-loaded arm with pulley)
Vehicles	Volvo FH / FM / FMX; Renault Trucks equivalents
Engines	D11, D13
Matching belt	Dayco 10PK1342SHD (10 ribs × 1342 mm)

Fitment varies by model year and engine variant. Send us your chassis number or the OE number from the old part, and we confirm the match before you order.

Which Volvo OE numbers does Dayco APV1151 replace?

Most buyers search by OE number. Here are the cross-references in one table:

Volvo OE number	Dayco part
20739751	APV1151
20935521	APV1151
21422765	APV1151
3979979	APV1151
85013020	APV1151

If your number is not here, send it to us anyway. Volvo often supersedes part numbers, and we can check the current Dayco reference for you.

Which belt pairs with the Volvo FH belt tensioner?

The Dayco belt we supply alongside APV1151 is 10PK1342SHD a Poly-V belt with 10 ribs and a length of 1,342 mm.

Dayco belt	Ribs × length	Volvo OE cross-reference
10PK1342SHD	10 × 1342 mm	20983634, 21955032

Dayco makes its heavy-duty Poly-V belts from EPDM rated to 130 °C. That matters on Volvo prime movers and rigids working hot, stop-start routes. High under-bonnet temperatures and long idling speed up belt and bearing wear.

The belt and the tensioner work as a pair. A weak tensioner lets the belt slip and glaze. A worn belt makes the tensioner arm travel further and work harder. Dayco recommends checking all the accessory-drive components together and replacing them where needed. That is why we quote the tensioner and belt as one job.

What does the tensioner do on a Volvo D13?

The accessory belt on a D13 drives the alternator, water pump, air-con compressor and other accessories. The tensioner keeps that belt at the right tension, all the time. A spring pushes the arm, and the pulley on the arm presses against the belt. As engine speed changes and the belt wears, the tensioner keeps the tension steady.

When it fails, everything on the belt stops together. The batteries stop charging, the engine can overheat, and the cab air-con goes warm. On a long-haul or distribution truck, that is a roadside breakdown and a lost delivery slot.

When should you replace a Volvo FH belt tensioner?

Check the tensioner every time you service the belt, and replace it when you see any of these signs.

1. Chirp or squeal that comes and goes, especially at start-up or when the air-con cuts in. The belt is slipping, often because the spring is weak.

2. Poor belt tracking. The belt runs off-centre, wears on one edge or frays.

3. Arm flutter. At idle, the tensioner arm shakes or bounces instead of holding steady.

4. Bearing noise or play. A rumble from the pulley, or wobble when you rock it by hand.

5. Grease leaking from the pulley seal.

If the belt is due and the tensioner has done the same hours, change both in one visit. A tensioner costs less than a second breakdown.

How do you order a Volvo FH belt tensioner from Scantruck?

1. Take the OE number from the old part, or from your Volvo parts system.

2. WhatsApp or email it to us with your chassis number.

3. We confirm the Dayco part and check stock in Singapore.

4. Collect from 9 Buroh Street, Singapore 627569, or book fitting at our workshop at 16 Gul Drive, Singapore 629424.

   
   

Scantruck Engineering Pte Ltd, Singapore is an authorised Dayco distributor in Singapore. That means genuine Dayco belt-drive parts for your Volvo and Scania trucks and buses, not grey-market stock. We also welcome enquiries from fleets and workshops across ASEAN.

For the full range, see our essential Dayco truck and bus parts guide and our Dayco belt tensioner guide

Frequently asked questions

Which Dayco tensioner fits a Volvo FH D13?

Dayco APV1151 is the belt tensioner for Volvo FH, FM and FMX trucks with D11 and D13 engines. Confirm fitment with your chassis or OE number before you order.

What is the Dayco part number for Volvo OE 20935521?

Volvo OE 20935521 cross-references to Dayco APV1151, a belt tensioner for Volvo FH, FM and FMX trucks with D11 and D13 engines.

Which Dayco belt goes with APV1151?

Dayco 10PK1342SHD, a Poly-V belt with 10 ribs and a length of 1,342 mm, is the belt we supply with APV1151 for Volvo FH and FM trucks. Confirm the belt with your OE or chassis number.

Should I replace the belt when I replace the Volvo FH belt tensioner?

Usually, yes. Dayco recommends checking all accessory-drive components together and replacing them where needed. A worn belt on a new tensioner, or a new belt on a worn tensioner, can fail early.

Belt squealing on your FH? WhatsApp the OE or chassis number to +65 8902 3249. We confirm the part and check stock for you. You can also call +65 6305 6600 or email marketing@scantruck.com.sg. To have it fitted, contact us and book a slot at our workshop at 16 Gul Drive, Singapore 629424. Need other parts? See the Dayco page or browse European truck parts.