Check these first
- Throttle: most small machines are far smoother at a third to a half throttle. Use full throttle only when you need the power.
- Hydraulic fluid temperature. Controls usually get harsher as the oil heats up.
- Loose control valve or joystick mounting bolts.
Technique first
- Combine functions. Swing with boom raise, or crowd with boom raise, is smoother than one function at a time.
- Feather the lever at the start and end of each stroke. Seat time makes a large difference over the first 20–30 hours.
Cheap fixes
- Stiffer return springs for pilot joysticks are sold for many machines and add resistance at the start of the stroke.
- On direct-acting lever machines, a short sleeve of fuel hose over the valve pins takes up slack in the linkage.
- Longer lever extensions give finer control on direct-acting valves.
Hydraulic fixes
- Fit adjustable flow-control valves to the cylinders that are hardest to control (usually the boom). Meter the return side and leave the pressure side full flow, so you lose speed but not force.
- A cushion valve on the swing circuit softens swing starts and stops.
- If the controls are harsh and the fluid runs hot, fix the cooling as well.
Stay safe: Do not lower relief pressures to make controls softer unless you have a gauge and the manual figures. It reduces lifting stability margin in unexpected ways.