Description

Galion T-600, T-400A, T-500A, T-500L, T-600B 1972 Workshop Manual

You ever try rebuilding a brake master cylinder on an old Galion grader without the factory prints? I have. That’s how you end up with a pedal that goes to the floor because the internal clearances are wrong. This Galion T-600, T-400A, T-500A, T-500L, T-600B 1972 Workshop Manual is the only way to get it right the first time. The manual is original OEM – not a copy, not a reprint. 22 pages, published 1972, straight from Galion Manufacturing in Ohio.

Old Style vs New Style: Identify Your Master Cylinder

Page 1 of this manual shows a table that splits every model into old style and new style based on serial number ranges. For a T-400A, old style runs from 1001 to 1007; new style starts at 1007 and up. That’s the difference between a unit that uses a different master cylinder section. If you grab the wrong rebuild kit – Wagner F102488 or whatever – you’re wasting time and money. The manual tells you exactly which style you have before you pull a single bolt.

Cranes use the new style exclusively according to that same table. Keep that in mind if your shop works on both graders and cranes.

Power Function: How the Brake Booster Works

Page 3 of the manual dives into the power function with a cutaway drawing and full flow description. The return spring holds the connector and power piston stationary. When you push the pedal, the valve piston moves right, reduces the by-pass port area, creates back pressure on the inlet side. That pressure shoves the power piston right and boosts the line pressure. The reaction piston gives you pedal feel – the harder you push, the more pressure builds. The relief valve is set to unseat at 180 psi above normal system pressure. That’s a critical spec for testing the unit after a rebuild. If your relief valve opens too early, the brakes will feel dead. If it doesn’t open, you risk snapping internal parts. The manual gives you that number.

Serial Number Ranges: Match Your Machine

Not all T-600Bs are the same. Serial number 1501 through 1779 for the T-600B – that’s the old style. 1779 and up is new style. T-600 itself runs 1292-1501 old style; no new style listed. T-500A and T-500L share the same range: 2601-3460 old, 3460 and up new. You cannot rely on the year code or paint color. You need the actual serial from the machine and the table on page 1. This manual saves you from guessing. If you are working on a T-700 or the 104-series rollers, that table covers those too.

Manual Function: What Happens When the Hydraulics Fail

Every brake system needs a fail-safe. The manual’s manual function section explains that if the hydraulic power assist stops working, the pedal force pushes the valve piston 5/32 inch to mechanically move the linkage. That travel spec – exactly 5/32 inch – is what you measure when bleeding or adjusting the linkage after a rebuild. The manual describes how the return spring holds everything in place during normal operation, but during manual operation the spring movement changes. That kind of detail is what separates a factory manual from a generic one.

The Galion T-600, T-400A, T-500A, T-500L, T-600B 1972 Workshop Manual: What You Get

This 22-page document covers the hydraulic power master cylinder used on four wheel service brakes for the listed Galion graders. It includes disassembly steps for both old style and new style units, cross-sectional drawings, flow diagrams, and instructions for testing the power function and manual function. The manual also covers relief valve pressure settings (180 psi delta) and reaction piston operation. You get the same paper that would have been handed to a dealer tech in 1972. No condensed version, no aftermarket editing. If you need additional lubrication specs or crane information, the Galion Graders Rollers Cranes Lubrication Shop Manual covers those systems. For later model updates, the Galion T-400A, T-500A, T-500L, T-600B, 90A 1974 Workshop Manual picks up where this one leaves off. And for operator-level procedures, the Galion 150A 150FA 1982 Operators Manual – Factory Specs & Safety is a solid companion.

For a broader understanding of how manual transmissions interact with braking on these old graders, you can read the Wikipedia article on Manual Transmission. That same article Manual Transmission also covers shift patterns that can affect how you approach a drivetrain overhaul, though it’s no substitute for a model-specific manual.

FAQ

Does this manual cover the T-700 grader?

No. The T-700 is listed in the serial number table but a separate manual covers that model.

How many pages and what year is this manual?

22 pages, published 1972. The pages include detailed text and diagrams for the hydraulic power master cylinder used on four wheel service brakes. The manual also references serial numbers for other models like 104C, 104HB, 118B, 118C, 160B, 160C, 160L, but the primary focus is on the T-series graders listed in the title. If you need crane brake info, note that all cranes use the new style master cylinder – that’s in the manual too.

Access the Factory Manual from AutoRepairManuals. You’ll get the exact PDF that came off the Galion press. No copy, no reprint – just the original 22 pages of factory data you need to get those brakes right.