Hydraulic System Troubleshooting Guide - Hydra-Tech

Hydraulic System Troubleshooting Guide - Hydra-Tech
Hydraulic System Troubleshooting Guide
Follow these steps to make an initial diagnosis of what may be
causing a low or no pressure situation with a Hydra-Tech hydraulic
power unit system.
1) Make sure the hydraulic hoses are not connected.
2) Start the unit with the oil cold
3) Activate the hydraulics by engaging the HYDRAULIC CONTROL VALVE
(H.C Valve) by turning it clockwise until it stops
4) Read the high pressure gauge.
5) If the pressure does not build to at least 2200psi (HT25DD and above or
1100psi for HT20G and below), then…
6) Stop the engine, remove the reservoir cover and locate the relief valve
7) Look to find the discharge pipe that comes off the relief valve body and dumps
into the tank.
8) Start the unit (with the oil cold) and engage the HYDRAULIC CONTROL
VALVE (H.C Valve) by turning it clockwise until it stops.
9) Reach into the tank and feel if any oil is coming out of the discharge pipe off
the relief valve.
10) If oil flow IS coming out, the relief valve cartridge may have some debris in it
and will need to be removed and cleaned. Or, the steel tubing going from the
relief valve to the H.C. Valve may be cracked or loose and needs repair. Or, the
aluminum block housing the relief valve cartridge may be cracked.
11) Check and or correct all of these conditions and return to steps 2-9, then…
12) If the proper pressure is not being attained, and/or if no if no oil is flowing
from the discharge pipe the hydraulic pump is probably worn out.
NOTE: Noises in the hydraulic system are usually from cavitation due to a bad
hydraulic pump. This is usually caused by dirt or contamination getting into the system.
When contamination and cavitation occurs, the pump will get hot and the pressure will
usually go up and down with the engine speed. If the hydraulic pump is replaced, the
reservoir will have to be drained and thoroughly cleaned, the suction strainer will need to
be cleaned, the system will need to be purged of any contaminated hydraulic oil, the
return filter must be replaced and the case on the hydraulic pump filled with oil BEFORE
re-starting the engine.
October 3, 2008
Was this manual useful for you? yes no
Thank you for your participation!

* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project

Download PDF

advertisement