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Any machine needs maintenance. In any machine you have moving parts. If you have moving parts you'll have friction on the moving surfaces - that means wear. The IP essentially consists of a camshaft with plungers / pistons that go up and down on top of the cam lobes. These will wear. Eventually it might be necessary to take your pump to a shop to get it all readjusted.
From a DIY mechanic's point of view, however, it is probably realistic to expect that the plungers / pistons can get gunked up with crud - that's why people talk about using additives to clean out their injection systems or to do such things as Italian tune ups - where essentially a load of good old hard work will help clean stuff out. A good example of this is a petrol hedge trimmer / chainsaw that only gets used once a year - a bugger to start at first but use it for a while with vigor! and it will start to become a good tool again.
On these engines, however, the chain elongation often plays a greater part in the effect of performance rather than how dirty / how out of adjustment the IP is. These Bosch IPs are really good bits of kit.
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