TM 5-3805-255-14
0078
ADJUSTMENT
00078
Main Relief Valve
00078
WARNING
Before attempting to adjust pressure relief valve, align frame halves and install loader
safety bar in straight-ahead position. Do not move steering wheel while adjusting
hydraulic system main relief valve.
Failure to install safety bar could lead to serious injury or death. In event of injury seek
medical attention.
DO NOT disconnect or remove any hydraulic system line or fitting unless engine is shut
down and hydraulic system pressure has been relieved. Tighten all connections before
applying pressure. Escaping hydraulic fluid under pressure can penetrate the skin,
causing injury to personnel. Failure to follow warning may result in injury or death to
personnel.
NOTE
In addition to regular periodic system pressure checks and checks to detect system
problems, main relief valve must be pressure checked and adjusted if it has been
completely disassembled or if repairs have been made to hydraulic system. Pilot section
of relief valve may be removed without disturbing valve setting. Refer to System
Pressures (WP 0002).
Remove pipe plug from main control valve and install 5,000 psi (34,474 kPa) capacity
pressure gauge.
0078-7