One of our members described the hydraulic layout of a rear-mounted knuckle crane on a truck, which was giving trouble, as follows:
“The pump is a bent axis Muncie pump 20 GPM, 4300 PSI. The pressure line is 3/4″ hose and steel tube. The pump intake line is a 2″ suction hose from the tank located on the crane base … Read more
The charge pump on a closed-circuit, hydrostatic transmission has a number of important functions. These include:
1. Replenish fluid lost from the transmission circuit due to volumetric inefficiency of the pump and motor.
2. Replace fluid purged from the circuit via the hot-oil flushing valve (where fitted).
3. Supply make-up fluid to compensate for load-induced oil compression and conductor (pipe/hose) … Read more
One of our members sent me this story from the coal face:
“I have a question about some trouble a hydraulic machine has been giving me at work. The pump set is designed with vane pumps located on top of the reservoir with suction strainers. The trouble is that at odd times a pump (any one of the three) will … Read more