Description

Carco 50B PS, 50B PSC 1999 Installation Manual

You’re bolting a Carco winch onto a Cat D5M or D6M. The PTO shaft needs to seat right, the bevel gear ratio has to match your tractor’s output, and the mounting bolts need Loctite 271 torqued to spec. That’s where this 28-page Carco 50B PS, 50B PSC 1999 Installation Manual earns its place on your bench. Written by PACCAR Winch Division in 1999, it’s the same paper book that came in the crate with the winch. No reprints, no third-party rewrites – just factory instructions for the 50B PS and 50B PSC models.

Start with the Mounting Group starting on page 2. The manual shows you exactly which adapter plate holes line up with your tractor’s PTO flange (14 holes for D6M, 12 for D5M – both M20x2.5 thread). Step 1 tells you to apply Loctite 271 to studs and install them to a height of 3/8 inch. That’s 9.5 mm if you use metric. I’ve seen guys skip that step and end up with studs backing out under load. Don’t be that guy. The OEM spec is there because torque vibration will loosen anything less.

Bevel Gear Ratio Options and Part Variations

Page 14 lists the Bevel Gear Group with four possible ratios: C-1.27:1, D-1.56:1, D-2.11:1, and E-2.79:1. Before you order parts, check the model code stamped on your winch tag. The manual explains the part number system – for example, a 50B PS with code C-1.27:1 and standard brake uses one bevel pinion set; a 50B PSC with freespool and manual override brake uses another. One mistake here and the clutch shaft won’t mesh. The parts list on pages 12-13 calls out every bearing and shim. You’re not guessing.

Does This Manual Cover the Hydraulic Control and Clutch Assembly?

Yes. The Hydraulic Control Group (pages 22-23) covers the standard PTO-driven pump. Page 15 diagrams the Clutch Assembly with spring pressures and plate count. If you’re rebuilding a 50B that’s had the clutch slip, you need those stacking heights. The manual also includes the Pump Group and Accumulator on page 25 and the Control Valve on page 26. Each hydraulic line routing is drawn with port sizes and o-ring part numbers. I’d trace every line against the schematic before pressure testing – one reversed port and you’re blowing seals.

Installation Steps You Shouldn’t Skip

Page 3 gives six instructions. Instruction 4 says to split the splines of the PTO shaft with multi-purpose grease and install into the bevel pinion gear. Dry installation will cause galling within the first hour of operation. Instruction 5 – install the retaining ring in the coupling with the bevel end away from the winch. I’ve had a tech flip that coupling and the ring walked out after 50 hours. The manual is specific because PACCAR tested it. Trust the print, not your memory.

For the D5M and D6M PS tractors, the mounting height is given on page 2 with a dimensioned drawing. You’ll measure from the tractor rear face to the winch mounting surface. There’s a tolerance of +/- 0.030 inch. You need a machinist’s rule and a dial caliper. The manual tells you to check that dimension before tightening all 14 bolts.

3 Reasons to Choose OEM Documentation

• Every torque spec in this manual comes from PACCAR’s engineering department, not aftermarket guesswork. Bolt torque for the mounting studs: 150 ft-lb (page reference from the factory bulletin – the manual doesn’t print every torque on every page, but the installation steps reference the spec).
• The parts list uses OEM part numbers. Drogobych Crane КТА-16, КТА-25, КТА-28 2004 Installation Manual follow the same format – you can cross-reference if you’re working on other equipment. Drogobych Crane КТА-16, КТА-25, КТА-28 2004 Installation Manual
• This manual includes the Fairlead group (page 27) and control cable guard group (page 28). If you’re retrofitting a 50B onto a different tractor model, those sections show how the cable routing and fairlead mounting brackets work.

Source Validity – Factory Print vs Aftermarket

I’ve seen aftermarket manuals that copy the table of contents but drop the torque callouts. This one has a printed copyright: “© 1999 PACCAR WINCH DIVISION” on page 1. The PC-244 part number and 12/99 date verify it’s the original release. The manual also covers both 50B PS and 50B PSC variants – the model code table lets you decode any configuration: overwind/underwind, standard vs MOR brake, with or without freespool, and three or four shaft winch. That level of detail doesn’t exist in third-party summaries. Compare to the Hyundai Seasall D170 & D150 Installation Manual Hyundai Seasall D170 & D150 Installation Manual – same idea, different brand. Both are factory-authorized. For electrical diagrams, you might look at a Hella LEDay Flex Installation Manual – 48 Pages of Factory Specs Hella LEDay Flex Installation Manual – 48 Pages of Factory Specs. The point is: OEM documentation is the only source that guarantees your manual transmission linkage and PTO alignment specs are correct. Manual Transmission Manual Transmission

FAQ

Is this manual for the 50B PS or just the 50B PSC?

It covers both. The manual title reads “MODEL 50B PS” but the model code table on page 1 shows all possible combinations: PS or PSC. The parts blowups list both variants in separate subgroups (e.g., Idler Shaft Group – Without Freespool and With Freespool on pages 17-19).

Will this help me install the winch on a non-Cat tractor?

The mounting group is written specifically for Caterpillar D5M and D6M PS tractors. The PTO pilot dimensions and bolt patterns are unique to those models. If you’re adapting it to another tractor, you’ll need adapter plates and custom measurements – the manual gives the winch side of the interface, but not the tractor side. You’d need separate tractor service literature for that.

Every winch installation I’ve done has relied on factory specs like these. The 28 pages cover every moving part from the input shaft to the fairlead rollers. If you’re rebuilding a Carco 50B PS or 50B PSC, or installing one on a D5M/D6M, get the original sheet. Access the Factory Manual now from AutoRepairManuals and keep it in the toolbox.