Case CX250C Crawler Excavator Operator Manual

Check the battery master switch is fully engaged and terminals are clean and tight. Verify fuel level — the tank holds 410 l (108.3 US gal). Inspect the fuel pre-filter and main filter for clogging; air intrusion in the fuel system is a common no-start cause on this machine. Review the troubleshooting chart on page 273 for the full engine no-start decision tree covering battery, fuel supply, and engine control system faults.

Check fuel level first — even a low tank can starve the supply pump on a slope. Inspect the fuel filter and strainer for clogging; a blocked filter will cut fuel delivery within seconds of startup. Verify no air has entered the fuel lines. If the fuel system looks clean, the engine control system may be logging a fault — consult the troubleshooting chart on page 273 covering supply pump, strainer, and control system failures.

White smoke on a cold morning usually clears after warmup — allow adequate warm-up time before loading the machine. If white smoke persists under load, check engine oil level; overfilling beyond capacity can cause this. Black smoke points to the air cleaner or DPD system: inspect the air cleaner element for restriction and check whether a DPD warning is active on the monitor. The DPD filter requires inspection every 4500 hours per page 254. See the exhaust smoke troubleshooting table on page 274.

Inspect each cylinder rod closely during daily walk-around. A weeping condition means a ring of oil appears on the rod each time it extends; a leaking seal drips excess oil from the gland each time the rod retracts — both definitions are on page 244. Before any repair, release hydraulic system pressure: lower the attachment to the ground, stop the engine, turn ignition to On, cycle the control levers a dozen times, then press the breather button on the hydraulic reservoir per the procedure on page 214. Total hydraulic system capacity is 250 l (66.0 US gal) — note the fluid level after inspection.

Verify the machine is brought up to operating temperature before loading — this is covered in the startup procedure in the Operating Instructions section. Check engine oil viscosity: high-viscosity oil in cold conditions is listed on page 273 as a cause of weak rotation. Inspect hydraulic fluid level in the reservoir. Allow the engine to idle and cycle the attachment controls gently for several minutes until hydraulic oil warms and flow normalizes. If sluggishness continues under normal temperatures, check for a clogged fuel filter reducing engine power per the troubleshooting chart on page 273.

Inspect the quick coupler pin visually before each use — a broken, bent, or missing pin prevents proper locking. Check that the safety device is not fouled with mud or debris. Verify hydraulic hose connections at the coupler cylinder are secure; a loose connection drops the pressure needed to actuate the lock. Lubricate the coupler cylinder bottom pin, locking pivot, cylinder top, and hook pivot every 50 hours with CASE AKCELA 251H EP MULTI-PURPOSE GREASE (NLGI 2) per page 183. The standard bucket pin diameter is 90 mm (3.5 in) — confirm the attachment pin matches this spec. See for the full quick coupler troubleshooting procedure.