Table 3-1. Operator/Crew Troubleshooting Table - CONT
TEST OR INSPECTION
HYDRAULIC SYSTEM - CONT
Check that all suspension isolation valves are in open position (para. 2-6).
Operate suspension isolation valves to open position with handle facing forward.
Check that platform, with or without payload, is not level.
Lower front and rear support legs (para. 2-22 and 2-23). Readjust platform height to have weight
supported by support legs and ensure platform is as level as possible.
Check that gooseneck isolation valve (para. 2-6) is in proper position for load conditions.
a. If semitrailer was moved or loaded while in ADJUST mode, suspension circuits may be
overloaded. Lower all four support legs (para. 2-22 and 2-23) and relieve pressure from
suspension circuits by lowering platform onto support legs.
b. If in ADJUST mode, check that front support legs are lowered to the ground and supporting most
of the load.
Check for partially shifted or stuck control valve handles on steering and suspension control valves
Operate hydraulic control valves and check that valves return to center (neutral position). Be sure
valve handles move freely and do not bind.
Identify which hydraulic control is unable to achieve normal hydraulic pressure during operation and
use Symptom Index for quick reference to continue troubleshooting.