Description

DAF LF45, LF55 2003 Workshop Manual

If you have a DAF LF45 or LF55 with steering wander or a leaking pump, the last thing you need is a third-party manual that guesses on torque values. Aftermarket reprints of truck manuals are notorious for swapping ft-lb for Nm or skipping the tightening sequences on front axle kingpins. That’s how components get damaged and shops eat warranty time. This 2003 Workshop Manual is the factory document DAF technicians used. It covers every steering-gear component and front axle variant for these trucks, with the torque charts printed right where disassembly starts.

Over its 328 pages, the manual breaks down the steering system into seven specific chapters. You get the steering gear general section, the steering box with its own torque table, the pump and reservoir assembly, and then four different front axle chapters: F36/F48, F60, 152N, and the steered trailing swivel axle. Each chapter starts with a general description, then lists the tightening torques in a dedicated sub-section. Need the torque for the steering box mounting bolts? It’s in section 2.2. Front axle kingpin preload for the F60? Section 5.2. No flipping through a universal table that lumps all axles together.

Steering Box and Front Axle Torque Specs

Every torque value in this manual comes from DAF’s 2003 engineering data. The steering box section (chapter 2) gives you the tightening torques for the mounting bolts, the pitman arm nut, and the input shaft seal retainer. The F36 and F48 front axle chapter (chapter 4) includes torque numbers for the kingpin bolts, wheel bearing nuts, and tie-rod ends. The same pattern holds for the F60 (chapter 5) and the heavier 152N front axle (chapter 6). If you’re rebuilding a trailing swivel axle, chapter 7 supplies those unique torque values. No aftermarket document I’ve seen includes the specific ft-lb for the swivel axle bearing cover – this one does.

What Does the Manual Cover for the Steering Pump?

The steering pump and reservoir get their own chapter (chapter 3). The general section shows the flow and pressure connections, and the tightening torques at the end include the pump mounting flange bolts and the pressure-line fitting. That’s critical because overtightening the high-pressure fitting can crack the casting, and undertightening causes a leak that aerates the fluid. The manual also references the reservoir lines in the same chapter, but keep in mind this is a steering-focused document – engine and driveline diagnostics are not included. For those, you would want the companion DAF LF/CF/XF Series Diagnostics Manual”>DAF LF/CF/XF Series Diagnostics Manual.

7 Systems Covered in This Workshop Manual

The table of contents lists exactly seven system chapters: 1) Steering Gear General, 2) Steering Box, 3) Steering Pump/Reservoir, 4) F36 and F48 Front Axle, 5) F60 Front Axle, 6) 152N Front Axle, 7) Steered Trailing Swivel Axle. That’s a focused scope. If your job involves pulling the steering box off an LF45 or replacing the tie rods on an LF55, you have the right manual. Each chapter ends with a tightening torque table, so you never have to guess whether a bolt is supposed to be 110 ft-lb or 130 ft-lb. The page numbers follow the factory system – chapter 2 starts at page 2-1, chapter 4 at 4-1, and so on. That makes cross-referencing with DAF service bulletins straightforward.

A common headache in fleet maintenance is the F60 front axle – the kingpin bore wears, and the torque sequence for the shim pack is often botched. The original 2003 manual’s section 5.2 gives the exact preload torque for the kingpin nut. I have seen aftermarket manuals quote 170 Nm when DAF specifies 150 Nm. That difference will hammer the bearings. This OEM doc eliminates that risk.

Get the Right Tightening Torques from Factory Data

When you open the PDF, go straight to the torque tables. For the steering box (page 2-2), the mounting bolt torque is listed. For the F36 front axle (page 4-3), the wheel bearing adjustment torque is given in ft-lb. You need to use a calibrated torque wrench – the manual assumes you own one – and follow the tightening sequence shown in the diagrams. The manual also warns that locking compound is required on certain bolts; the torque table notes which ones. No “basic steps” or “simple fixes” – just the specification you have to hit.

This manual does not include engine, transmission, or brake system data. Those are separate documents. If you are rebuilding the gearbox, check the DAF LF45 LF55 Gearboxes and Clutch Workshop Manual”>DAF LF45 LF55 Gearboxes and Clutch Workshop Manual. For a broader annual reference, the DAF LF45 LF55 2004 Technical Manual”>DAF LF45 LF55 2004 Technical Manual covers specs for the following year. And if you’re doing work on a Manual Transmission, that unit’s manual will have its own torque data – never mix axle and transmission specs.

F36/F48 Front Axle: Disassembly Procedure

Chapter 4 walks through removing the steering knuckle, the kingpin, and the wheel bearing on the F36 and F48 axles. The general section explains the shim adjustment for kingpin end float. Tightening torques in section 4.2 cover the knuckle retaining bolts and the hub nut. If you are swapping a stub axle on an LF55 with the F48 axle, this chapter tells you the sequence. No pictures of the procedure? You get text descriptions that are typical of factory manuals – dense but precise. Pair it with a printed copy on your workbench; the PDF allows full search, but I still prefer paper for dirty jobs.

For the Manual Transmission work, that manual is separate. DAF never printed a single “everything” book; they split by system. That’s why this steering workshop manual is essential for anyone touching the front end of a 2003 LF45 or LF55.

FAQ

Does this manual include all tightening torques for the front axles?

Yes, it includes all tightening torques for steering box, pump, and all front axle models.

How does the manual handle the different front axle variants, and what else is excluded?

The manual does not cover the engine or transmission. It focuses exclusively on the steering system and front axles. The TOC lists steering gear general, steering box, steering pump/reservoir, and four front axle variants: F36/F48, F60, 152N, and the steered trailing swivel axle. Each section includes general information and tightening torques. Page numbers in the PDF match the factory numbering. The manual is 328 pages, with each chapter having its own torque table. If you need brake system data, that’s a different DAF publication. For complete fleet coverage, pair this with the diagnostics manual.

Don’t waste a morning hunting down a spec DAF changed in mid-2003. You have the 2003 factory data right here. Put a wire tag on the work order: torque values verified. Access the Factory Manual and keep the real numbers on your bench.