Spearhead Twiga 555, Handbook

Page: 61 / 63

Spearhead TWIGA
60
Pump & Motor Failure
There are many reasons for pump and motor failure, cavitations (suction of air), peak
pressure, contamination. These can be avoided by the following:

Never run out of oil

Never run a cold machine straight up to speed, ensure the engine idle speed before
engage/disengage the head motor.

Never increase or decrease engine speed quickly

Regularly check that suction hose and pump fittings are tight.

Never stop or start the rotor at 540r.p.m

Never cause sudden movements to the arms via your controls or bumps in the
ground as pressure spikes will by transmitted back to the pump, resulting in failure.

Avoid striking the rotor on obstacles i.e., road gullies as this causes pressure spikes.

Never transport the machine with the PTO in gear.

Never select 1000 speed gear for economy start up, speed is too high.

Never operate above recommended PTO speed 540r.p.m. and risk over heating.
Remember: pump and motor warranty is limited to replacement due to faulty materials or
manufacture. Cavitations, contamination and peak pressures are easily detected on
inspection, warranty will not be considered if failure is due to misuse.