TEST OR INSPECTION
HYDRAULIC SYSTEM - CONT
Check suspension pressure while trying to adjust platform (para. 2-19).
a. If all three suspension gages fail to reach pressures above 3800 psi (26201 kPa), or if system
pressure gage reads lower than suspension gages or lower than normal pressure for current
payload condition while trying to adjust platform, check system supply (symptom 18, steps 3, 4,
b. If only one suspension circuit fails to reach 3800 psi (26201 kPa), and other two operate normally,
check for signs of external leakage or ruptured hoses (symptom 16). Identify failed hydraulic
circuit and use Symptom Index to continue troubleshooting.
Be sure all four support legs (para. 2-22 and 2-23) are lowered and supporting the
platform prior to checking the gooseneck isolation valve handles for proper
operation or injury to personnel may result .
a. Linkage should be tight and adjusted so that all valve handles move the same distance and open
each valve equally. Adjust valve linkage as required (para. 4-84).
b. Check each valve handle to be sure both valves are being operated. Tighten or remove and
Suspension adjustments are sluggish or slow within a suspension circuit.
a. Counter balance valves may be dirty, leaking, or defective. Remove counter balance valves CB1
(front suspension curbside), CB2 (front suspension streetside), or CB3 (rear suspension) from
suspension control manifold. Clean and/or replace items removed (para. 4-79).
b. Flow control valves may be dirty or defective. Remove flow control valves FC1 (front suspension
curbside), FC2 (front suspension streetside), or FC3 (rear suspension) from suspension control