There is no need to hunt for Jungheinrich TFG 430 parts one by one. This page lists more than 40 items for this LPG forklift, such as seats and lighting.
An LPG forklift like the Jungheinrich TFG 430 keeps its driver in the same seat for an entire shift, so the operator area wears faster than anything else. The more than 40 parts on this page cover the seat and driving position, along with a starter motor, an air filter and lighting. They are made by GRAMMER, GRANIT, HELLA and SACEX.
The seat contact switch is the part that catches people out. It tells the truck that someone is sitting down, and without that signal the truck will often refuse to drive or lift. If your TFG 430 stops working after a cushion swap, first check that the switch plug is properly reconnected and that the new cushion actually presses the switch. A worn cushion can also make the contact drop out now and then, which feels like the truck cutting out for no reason.
A loose armrest or a back extension that will not stay put sounds minor, yet after a full shift the driver feels it in neck and shoulders. The adjustable back extension in blue and black and the armrests bolt to the seat with a few fasteners. Use the existing mounting points and do not overtighten, as the bolts often thread into plastic. While you are there, check the shock absorbers and gas struts of the seat suspension. If the seat bottoms out over bumps or keeps bouncing, they are worn, and a new cushion alone will not cure that.
On the engine side there are reduction starter motors and an air filter. A starter that cranks slowly is not always worn out. Measure battery voltage while cranking and check the cables and earth strap first, since a poor connection behaves exactly like a tired starter.
Lighting parts include an LED rotating beacon, a halogen bulb, a round reflector, a changeover relay and switch symbols such as the red hazard symbol.
Confirm on the data plate that the truck is a TFG 430. For seat parts, the seat type from the MSG family or the upper part number matters as well, and you will find it on the label under the seat. For the starter motor and air filter, the number on the old part is the safest reference. Other trucks from this maker are under Jungheinrich parts.