TM 5-3805-262-20
3-25. HYDRAULIC SYSTEM TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. BUCKET CLAMSHELL CYLINDER ASSEMBLIES OPERATING SLUGGISHLY OR POORLY (ALL OTHER
CYLINDERS OPERATE PROPERLY) (Cont).
Step 2.
Start engine and turn loader so that it is facing straight ahead.
Shut off engine and engage transport/service link (page 9-8).
Start engine and operate at idle speed.
Operate CLAM control lever in both OPEN and CLOSE positions.
B e f o r e p e r f o r m i n g f o l l o w i n g , b e s u r e t h a t t r a n s p o r t / s e r v i c e l i n k is
e n g a g e d . F a i l u r e t o d o s o c o u l d c a u s e s e r i o u s i n j u r y o r d e a t h d u e to
chassis pivoting and crushing you when you are working in area between
front and rear chassis.
Tell assistant to check hoses, lines, and fittings between control
valve and clamshell cylinder assemblies for hydraulic oil leakage.
Shut off engine.
a . I f h y d r a u l i c o i l l e a k a g e i s s e e n , t i g h t e n h o s e f i t t i n g s . If
tightening does not stop leakage, replace part(s) (page 11-32).
b. If hydraulic oil leakage is not seen, go to step 3 below.
Step 3.
Inspect clamshell cylinder assemblies (page 11-71).
a. If clamshell cylinder assemblies do not check okay, replace
(page 11-72).
b. If clamshell cylinder assemblies check okay, go to step 4 below.
Step 4. Start engine and operate at idle speed.
Place CLAM control lever in CLOSE position until clam is completely
c l o s e d.
Shut off engine and operate control levers several times to relieve
hydraulic system pressure.
H y d r a u l i c s y s t e m p r e s s u r e i s o v e r 2 0 0 0 p s i a n d h y d r a u l i c r e s e r v o i r is
pressurized with compressed air. Before loosening or disconnecting any
h y d r a u l i c h o s e s , l i n e s , o r f i t t i n g s ,
l o o s e n h y d r a u l i c r e s e r v o i r f i l l
c a p , a n d o p e r a t e a l l h y d r a u l i c c o n t r o l l e v e r s t o r e l i e v e h y d r a u l i c
system pressure. Failure to do so could cause serious injury or death .
If you are injured obtain medical assistance immediately.
3-192
