Description

Dynapac LH 300, LH 700, LH 800 2002 Workshop Manual

If you’ve ever rebuilt an eccentric housing on a Dynapac plate without the factory specs, you know the headache. You guess the torque, hope the control shaft timing is right, and pray the piston doesn’t seize after fifty hours. That’s what this Dynapac LH 300, LH 700, LH 800 2002 Workshop Manual eliminates. It’s the same 28-page binder that sat on the bench at Dynapac dealers in ’02. No aftermarket reprints, no scanned guesses. This is the original PDF from the factory in Sweden.

Technical Data and Tightening Torque Tables

Page 3 gives you the technical data – weights, oil capacities, hydraulic pressures. Page 4 is the tightening torque tables. You want the spec for the eccentric housing bolts? It’s right there, in lb-ft. I’ve seen guys wing it with a click wrench set to some number they found on a forum. Then the housing leaks oil all over the job site. The factory torque spec is not optional. This manual puts it in black and white, with the exact sequence for the control shaft nut. Use it.

How Does the Manual Handle the Hydraulic System?

Pages 6-8 give you the hydraulic diagrams for all three models. LH 300 on page 6, LH 700 on page 7, LH 800 on page 8. The symbols are standard ISO, but the routing is model-specific. If you swap a motor from a 700 into a 300 frame, the port locations are different. The diagram shows you which line is pressure and which is return. Page 9 explains the hydraulic system operation – how the eccentric element gets its oil supply. That section saved me two hours on a 700 that was chattering. The problem was a clogged orifice in the control shaft. I found it because the manual told me where to look.

3 Assembly Procedures for LH 300/700/800

Each model has its own assembly section. LH 300 runs from pages 11-15, LH 700 from 16-20, LH 800 from 21-25. The steps break down into piston, control shaft, drive shaft, eccentric housing assembly, and hydraulic motor. Each part is shown in an exploded view with part numbers. The marking of the eccentric element on page 15 tells you how to check timing marks. I watched a tech install a piston 180° out once. The machine vibrated like a paint shaker for ten minutes before a bearing blew. The manual’s step sequence prevents that. Follow it.

Dynapac LH 300, LH 700, LH 800 2002 Workshop Manual: Why It’s the Only One I Trust

There are aftermarket manuals that claim to cover these plates. They usually lift the hydraulic diagram from the 700 and apply it to the 300, which is wrong. This factory manual has three separate hydraulic diagrams. The tightening torque tables are printed in Sweden, not photocopied in a back office. The serial numbers are given: LH 300 from S/N *30060138*, LH 700 from S/N *70030178*, LH 800 from S/N *80030180*. If your machine falls in that range, this is the exact document Dynapac used. It’s 28 pages of no filler. If you need the Dynapac LH 300 Parts Catalog to order seals, I recommend getting that too.

Principles of Operation: What Every Mechanic Should Know

Page 5 covers the principles of operation. It explains how the vibrating plate generates force through the eccentric element. Understanding this helps when you troubleshoot. A 700 that won’t reverse? Could be the control shaft not shifting. This section shows the oil flow path inside the eccentric housing. Oil is the lifeblood of these plates. If you get the fill level wrong, the eccentric element starves and the bearings die. The manual tells you how to check eccentric element oil (page 26, “Check eccentric element oil”) and how to drain and refill (page 27). Don’t skip that.

Follow the Factory Torque Specs

Torque is not a suggestion. The tightening torque tables on page 4 list values for M6, M8, M10, M12 bolts in standard and high-strength grades. All in lb-ft. The manual also covers special torque for the hydraulic motor mounting bolts. I’ve seen stripped threads from over-torquing. Use a calibrated torque wrench. Set it to the value in this manual. Period.

What oil should I use in the eccentric housing of my Dynapac LH 700?

Use SAE 10W-30 or 10W-40 engine oil. The manual says fill to the level of the fill plug. Overfilling causes pressure buildup and seal leaks. Check the oil with the machine level, not tilted.

Does this manual cover machines built after 2002?

It covers LH 300 from S/N *30060138*, LH 700 from S/N *70030178*, and LH 800 from S/N *80030180*. If your serial number is lower, the manual may still apply but verify. Dynapac changed the eccentric housing design in later years, so for machines after serial numbers listed, check the DYNAPAC LH 300 LH 700 2001 Workshop Manual or the Dynapac LH 300 Spare Parts Catalog for updates.

You’ve worked on enough equipment to know that time wasted guessing is money lost. The OEM factory manual gives you the data Dynapac engineers wrote. The torque is correct. The hydraulic routing is verified. The eccentric assembly sequence won’t leave you with leftover parts. If you need the fundamentals of how a Manual Transmission works, that’s a different class. For these plates, you need the Factory Manual. Access the Factory Manual, print the pages you need, keep it in a ziplock bag on the job site. Your future self, three hours into an eccentric housing rebuild, will thank you.