Diagnosing hydraulic faults on the CASE CX250C without the factory service manual means guessing at circuit pressures, improvising special tool alternatives, and accepting longer repair times than necessary. The official CNH service manual eliminates all of that — organized by system, with cross-references between hydraulic schematics and component assembly procedures.
Manual Reference: Part Number 84402826
The CX250C service manual carries CNH part number 84402826, first edition August 2011. It covers both the standard CX250C and the CX250C LR (Long Reach) variant with Tier 4 engine compliance. The manual sections include:
- Undercarriage Section: Track roller replacement, track tension adjustment (standard sag: 270-290 mm), sprocket and idler removal, floating seal installation. Includes three special tool part numbers for bushing removal and seal installation.
- Swing System: Swing motor disassembly, swing bearing ring gear backlash measurement (max 0.8 mm), swing reduction gear oil spec (API GL-4, SAE 80W-90).
- Hydraulic System: Main pump test procedures, pilot circuit pressure (35 kg/cm2), main relief setting (360 kg/cm2), and negative flow control circuit operation. Flow test points identified by photo.
- Cylinders: Boom, arm, and bucket cylinder assembly with rod seal kit part numbers. Assembly jigs KHV0511-KHV0539 listed by rod diameter (65 mm to 120 mm).
- EST Diagnostic Tool: Y-cable 380060269 required to connect the Electronic Service Tool to CX250C controllers for fault code reading.
Hydraulic System Specifications — CX250C
- Main relief valve: 360 kg/cm2 (35.3 MPa / 5,120 psi)
- Pilot relief: 35 kg/cm2 (3.43 MPa / 498 psi)
- Swing circuit relief: 300 kg/cm2 (29.4 MPa / 4,350 psi)
- Travel circuit relief: 360 kg/cm2 (35.3 MPa)
- Hydraulic oil capacity: approx. 230 L (main tank)
- Oil specification: ISO VG 46 anti-wear hydraulic oil
Full Series Coverage — 277 PDFs
The crawler excavator collection covers the complete CNH excavator family:
- Case CX Series — CX17B through CX470B, plus 9030B, 9050B, 9060B, and 250C
- Fiat-Allis FE/FH/FX Series — Medium through large hydraulic excavators
- Fiat-Hitachi EX Series — EX55 through EX455 and larger variants
- New Holland E/E-B/E-C/E-M/EC/EH Series — Complete NH excavator range
Mixed fleets are the norm. A rental company running CX250C alongside NH E215C units needs schematics for both machines without paying separately for each manual.
Download the Crawler Excavator Manual Collection
Frequently Asked Questions
Does the CX250C manual include the LR variant?
Yes. Part number 84402826 covers both the standard CX250C and the CX250C LR (Long Reach) boom configuration.
Which special tools are needed for undercarriage work?
Three jig numbers for the lower roller: bushing removal jig, bushing press-fit jig, and floating seal installation jig. For cylinders, jigs KHV0511 through KHV0539 are selected by rod diameter.
Is the Tier 4 engine covered?
The CX250C manual covers engine-to-machine interface systems. FPT diesel engine internals are in the Diesel Engines collection.
