Description

CASE Poclain 788P, 788C 1996 Training Manual

If you’re working on a CASE Poclain 788P or 788C and you don’t have the factory training manual, you’re guessing. Guessing on a hydraulic system that pushes over 4,000 psi gets expensive fast. I’ve seen guys blow O-rings, trash pumps, and put a swing motor through the cab door because they used aftermarket torque values. Don’t be that guy. This 1996 Training Manual from CASE Poclain gives you the exact numbers from the engineers who built the machine. It’s 60 pages of direct-from-the-training-center specs, not some condensed aftermarket cheat sheet.

1996 Training Manual for CASE Poclain 788P and 788C

The manual breaks down the entire hydraulic system for the 788C and 788P. You get the technical specifications for both models, including engine idle speeds (low idle 900-1000 rpm, medium idle 1180-1220 rpm, max mode 2180-2220 rpm, etc.), pump types, flow rates, and pressure settings. That’s from the 788C Technical Specifications chapter.

788C Technical Specifications – Installed Power and Pressures

Factory specs for the 788C include installed hydraulic power, maximum flow, pressure for attachment, travel, and options, servo circuit pressure, load sensing valve setting (Δp between M1 and M3), torque regulation valve setting, and hydraulic filters. These numbers are critical when setting relief valves or troubleshooting a weak circuit. Related manufacturers also offer the Poclain 988P 988C 1996 Training Manual and the CASE POCLAIN 1288 1488 1998 Training Manual for larger excavators. For smaller machines, the CASE Poclain 488, 688, 888, 1088, 125B User Manual – Factory Specs is available.

Locate Hydraulic Components on the 788P

The location of hydraulic components chapter for the 788P shows you exactly where every valve, pump, motor, and filter sits. That saves hours of tracing lines when you’re replacing a failed component. The manual also covers the general hydraulic system for the 788P, which differs in some ways from the 788C. For the mechanical drivetrain side, you might refer to a Manual Transmission resource if you’re dealing with gear reduction issues. The swing motor and travel motors interface with gear reductions that function similarly to a Manual Transmission.

Single-Speed vs. Two-Speed: Which System Is in Your Machine?

Your machine may have either a single-speed or two-speed hydraulic system. The manual details both. The two-speed system (listed as ‘TWO-SPEED 988 C GENERAL HYDRAULIC SYSTEM’ in the TOC) uses a different travel motor configuration. If you’re swapping a motor, you need to know which version you have. This manual gives you the schematics.

OEM vs. Aftermarket: What the Factory Manual Delivers

Aftermarket manuals often leave out critical details like the forced feed circuit, counter pressure valve settings, and the exact filtration specs. This OEM Training Manual includes the full hydraulic system general information: power unit, servo, tank, filtration, control valves, swing control, linear and rotary components, forced feed, oil cooling, and connective components. It even specifies the union types (SAE clamps with ISO seals on tubes ≥20 mm, crimped rings with nuts on tubes <20 mm). That level of detail matters when you're ordering replacement hoses.

Filtration and Control Valves: Factory Specs You Need

Filtration is covered on the general return circuit with by-pass and clogging indicators, on the load-sensing information line (LS1 and LS2), and on functional leaks return. Control valves are parallel type, closed centre and closed outlets with proportional effect and load sensing. Each receiving component has a flow regulator (balance valve). The manual explains these systems so you can diagnose pressure drops and contamination issues. The 788C single-speed general hydraulic system and the 788P general hydraulic system are each diagrammed and explained in detail. You’ll see the exact configurations for linear receiving components (double action cylinders with dashpot) and rotary components (fixed displacement swing motor, variable displacement travel motors with automatic static brakes). Forced feed with counter pressure valves on return circuits for attachments, travel, swing, options, and servo is also covered.

That’s the kind of detail that prevents comebacks.

FAQ

Does this manual cover both the 788P and 788C?

Yes, the manual includes separate sections for each model, including technical specifications and hydraulic system diagrams.

What kind of information is in the training manual?

The manual contains the full hydraulic training curriculum from the CASE Poclain Training Center. It covers the general hydraulic system theory, component locations, technical specifications such as engine idle speeds (low idle 900-1000 rpm, medium idle 1180-1220 rpm, max mode 2180-2220 rpm, eco mode 1880-1920 rpm, fine mode 1580-1620 rpm), pump types (constant torque variable displacement with load sensing, fixed displacement swing pump), pressure settings, valve adjustments (load sensing Δp, torque regulation), filtration details (return circuit with by-pass indicator, load-sensing line filters, leak return), control valves (closed centre parallel type with proportional effect, open centre swing valve), linear and rotary components with dashpot and flow limiters, forced feed and counter pressure valves, oil cooling, and connection specifications with SAE/ISO standards. It includes schematics for single-speed and two-speed hydraulic systems.

Is this a reprint of the original manual?

This is a direct scan of the 1996 CASE Poclain Training Center document. It is not a third-party reproduction.

How many pages does the manual have?

60 pages of OEM technical content, covering both models.

Stop second-guessing your hydraulic repair and get the data that belongs on your workbench. Access the Factory Manual from AutoRepairManuals and keep your excavator running right.