Caterpillar 428C, 438C 2000 Service Manual – Factory Hydraulic Control & Adjustment

If you’re pulling wrenches on a Caterpillar 428C or 438C backhoe loader and you’re guessing stand-by pressure or cycle times, stop right there. That’s how you burn out a pump or blow a seal. This 2000 Service Manual gives you the factory sequence for checking pressures, setting the torque limiter, and verifying cycle times. It’s 34 pages of exactly what Caterpillar’s own techs used. No reprints, no third-party summaries.

Stand-By Pressure and Maximum Pressure – Why Specs Matter

The very first section in this manual – Pression d’attente (Stand-by) on page 2 – tells you the exact pressure to see before the control valve shifts. I’ve watched guys skip that check and then spend half a day chasing a drift on the loader arms. Page 2 gives the stand-by spec. Then Pression maxi (tous mouvements) on page 4 lists the maximum pressure for every circuit. You don’t guess that number. You set it with a gauge. This manual shows the sequence.

Cycle Times – The Real Test of Hydraulic Health

After pressures, the manual goes into cycle times: lift, crowd, dump. Temps de cycle levage AV (page 6) and Temps de cycle cavage/vidage (page 7). If the bucket takes more than a specified number of seconds to curl at max RPM, something is wrong – either a pump is wearing out or a relief valve is leaking. The manual gives the factory time spec for 428C and 438C at both high idle and low idle. You won’t find that in a Chilton book.

Does This Manual Cover Torque Limiter Adjustment?

Yes, and that’s one of the reasons this manual is worth having. The Contrôle du limiteur de couple section on page 12 walks you through graphing torque converter output and adjusting the limiter. You get the procedure for tracing the graph, reading the results, and adjusting the override valve. Also included: Réglage du limiteur de couple on page 16. If you’ve ever had a backhoe that loses power under load but passes a stall test, the torque limiter is a common culprit. This manual shows the factory method to dial it in.

34 Pages of Verified Data – No Aftermarket Guessing

Thirty-four pages might sound slim, but every page is packed with test procedures and reference charts. The REFERENTIEL 438C 2RD section lists reference engine speeds, reference pressures, secondary (anti-shock) pressures, and cycle times for every function – lift, crowd, bucket, boom swing, auxiliary. Also covers accumulator filling for the anti-sway system. These are the numbers Caterpillar used at the factory. Aftermarket manuals reprint vague ranges. This one gives specific values.

Audience Fit – Who Needs This Manual

Home garage guys who bought a used 428C or 438C and want to keep it running without paying dealer rates. Also professional mechanics who need to verify a system after a repair. If you’re new to hydraulics, the step-by-step format with diagrams (see page 13 for the graph trace) will keep you from making a mistake. Beginners: pay close attention to the safety warnings about pressurized oil – the manual doesn’t sugarcoat it.

Source Authenticity – OEM vs Aftermarket

This is a direct scan of the original Caterpillar publication. It was produced by Bergerat Monnoyeur, CAT’s training arm, in November 2000. The document codification is 345. Every torque spec, pressure setting, and cycle time comes from the Caterpillar engineering group. Aftermarket manuals genericize these values, and I’ve seen them cost people a pump. Stick with the factory document.

Related Manuals

• Caterpillar 428C 1998 Parts Catalog
• Caterpillar C175, 3600, C8.7, C12.9 2016 Service Manual – Factory Tool Catalog
• Caterpillar 3500B 2002 Service Manual – Factory Specs
• Manual Transmission
• Manual Transmission

Can I use this manual for a 428C built before 2000?

This manual specifically covers the C-Series (428C, 438C) from model year 2000. Earlier series may have different pressure specs and different torque limiter adjustments. Check your serial number prefix before relying on these values.

Does it include wiring diagrams or engine repair procedures?

No. This manual is focused exclusively on hydraulic control system adjustments – pressure checks, cycle times, torque limiter. It does not cover the engine, transmission, or electrical system.

Download the Factory Manual now and get the real numbers for your 428C or 438C backhoe loader. Stop guessing pressures and cycle times. One file, 34 pages, direct from Caterpillar’s training library.