TM 9-2330-381-14
4-20. HYDRAULIC SYSTEM FLUSHING (CONT)
SUSPENSION SYSTEM FLUSHING
NOTE
This procedure requires use of a Y-hose.
A drain pan must be placed to catch excess fluid drainage. Fluid collected into
drain pan should be drained into waste oil receptacle as often as needed.
1.
Place drain pan under #1 streetside suspension isolation valve (13).
2.
At #1 streetside suspension assembly, remove two suspension hoses (14) from tube nipples (15).
Install
caps/plugs into hoses.
3.
Remove caps/plugs installed and connect free ends of Y-hose assembly (5) to tube nipples (15) on suspension
isolation valve (13).
4.
Open suspension isolation valve (13) at affected suspension assembly, handle facing forward toward front of
semitrailer.
5.
Pull up and hold front suspension streetside valve handle (para. 2-6). Have a person check hydraulic tank for fluid
flowing back through return hose (4).
6.
Hold valve handle for 15 minutes after fluid starts flowing back into hydraulic tank; then, release valve handle.
Monitor filter indicator.
7.
Close affected suspension isolation valve (13), handle facing outboard.
8.
At #1 forward streetside suspension assembly, remove Y-hose assembly (5) from tube nipples (15).
Install
caps/plugs into hoses.
9.
Remove caps/plugs installed into suspension hose assemblies (14) and reconnect suspension hose assemblies
(14) to tube nipples (15).
10.
Repeat steps 1 thru 9 of this procedure for each suspension assembly until all 10 suspension assemblies have
been flushed. Operate appropriate valve handles for each suspension assembly as required (para. 2-6). Monitor
filter indicator.
11.
After all 10 suspension hose assemblies and isolation valves are flushed, install caps/plugs onto Y-hose assembly
(5). Leave return hose assembly (4) secured to hydraulic tank.
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