Description

Mobilift MA 30, MA 30II, MA 40, MA 40II, MA 50 Technical Manual

You ever tear into a Mobilift MA 30 differential and wonder if the cage torque is 5 ft-lbs or 15? I’ve seen guys guess and snap pinions. This Mobilift MA 30, MA 30II, MA 40, MA 40II, MA 50 Technical Manual is the factory document from White Motor Corporation. 277 pages of what you actually need: torque specs, adjustment procedures, and parts breakdowns. Not a reprint from some third-party that copied the wrong numbers.

That supplement bulletin C-280 addresses a specific differential cage torque: 5 to 15 foot-pounds for four-pinion cages. Page 1-35 spells it out. If you skip shim adjustment, you’ll either have a loose cage or bind the pinions. The manual also warns about the pressure regulator valve (35A9200) – do not install it on trucks with a 2-pinion differential. That’s the kind of detail you pay for in labor if you don’t have the book.

What This Manual Covers

The document spans the full MA series: MA 30, MA 30II, MA 40, MA 40II, and MA 50. Serial number ranges include 2800001-2800384, 26100001-26101392, 2620001-26200418, and 33200001-33200124. It’s a parts, operation, and maintenance manual with bulletins C-280 and C-348. The Cascade triplex mast section (Figs. 2-37 and 2-38) covers crosshead wear shoes and shim adjustments to keep interlocking latches from failing. If you need parts for the uprights, check the White Mobilift Simplex Uprights Parts Catalog 1973 for a companion guide.

277 Pages of Factory Documentation

You’re getting the full 277 pages – not a condensed version. This includes the set screw and locknut procedure for the reverse idler gear in the transmission. The set screw adjustment: turn in until the idler shaft bottoms, then back out 25 to 40 degrees (1/8 turn or less) and lock it. Proper end clearance on the reverse idler gear prevents gear clash. The transmission section covers the Manual Transmission reverse idler sequence. Understanding Manual Transmission basics helps when setting that end clearance – but you still need the factory torque values from this manual.

Torque Specs and Differential Adjustments: Factory Precision

Page 1-35 gives the differential cage torque: 5 to 15 ft-lbs with four pinions. Page 1-39 adds a caution about the pressure regulator valve – don’t mix it with 2-pinion differentials. Also: drive axle bearings must be repacked with automotive-type, multi-purpose lithium base grease containing moly-disulfide additive. No shortcuts. This manual also covers the torque for the locknut on the set screw. Do not guess the torque. Use the manual.

For related models, the Mobilift MY40, MY60 Parts Catalog – OEM Factory Specs | AutoRepairManuals covers different chassis, and for crane gear, see Drogobych Crane КТА-16, КТА-25, КТА-28 2004 Installation Manual.

Who Needs This Manual?

If you own a Mobilift forklift from the MA series – whether it’s a MA 30, MA 30II, MA 40, MA 40II, or MA 50 – you need this. DIY owners trying to keep a vintage truck running, small shop owners servicing these lifts for customers, and technicians who refuse to guess on transmission adjustments. Without it, you’re flying blind on the reverse idler gear set screw and the differential shim stack.

Trust Factory Specs Over Aftermarket

Aftermarket manuals leave out the bulletins. This one includes C-280 and C-348 – factory updates that changed maintenance instructions and part numbers. The supplement even tells you which serial number ranges apply. You get the real White Motor Corporation document, not a photocopy of a photocopy. AutoRepairManuals holds the largest collection of OEM shop manuals in North America. That’s what you’re buying.

Does this manual include wiring diagrams?

No. This is a mechanical parts, operation, and maintenance manual – no electrical schematics.

Can I use this manual for the MA 50II?

Yes. The manual covers MA 50 and MA 50II as listed in the title. The supplement bulletin C-280 includes serial number ranges 2800001-2800384, 26100001-26101392, and others. If your truck falls within those ranges, the torque specs and procedures apply. However, note the caution about the pressure regulator valve: later model trucks with 4-pinion differentials use valve 35A9200; do not install it on 2-pinion differentials or repair differential 39A2240. The manual identifies case designs – early cases (35A5180) lack the large plug in the top, while later cases (35A7816) have it. Check your differential before ordering parts.

You need this on your bench when you pull the differential or adjust the transmission. Access the Factory Manual from AutoRepairManuals and stop relying on memory.