Six faults. Cause, test, fix.

Each page carries the probability-ranked causes, the test that separates them, what actually fixes the unit, and which units are involved.

Fault	System	Severity
Swing is slow, or will not hold a load	Swing circuit	High
The machine tracks off to one side	Travel circuit	High
Travel is weak, or dies on a grade	Travel circuit	High
The pump growls, whines or knocks	Pump	Medium
Pressure drops under load, everything slows	Pump	High
Hydraulic oil runs hot	heat	Medium

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One photo of the nameplate and one of the pump from the side. We confirm the variant, then quote — the price holds for seven days.