RHINO 95HD, Operator'S Manual

Page: 33 / 42

F3788-7-04 Maintenance Section 5-5
HYDRAULIC TROUBLE SHOOTING
Hydraulic trouble shooting material presented in this
section is offered as a guide to diagnosing probable
causes and remedies for general operational problems.
Match your problem with the typical problem examples
given in the possible cause column. These numbers
correspond with the possible cause and correction
paragraphs that follow.
NOTE: If, when using the following chart, it is decided that
overhaul of components or pressure adjustment is
necessary, it is recommended that your dealer make
these repairs. He is equipped to do this work.
PROBLEM POSSIBLE CAUSE
Machine fails to operate
when initially started.
1, 2, 5, 7, 15, 23, 31
Machine looses power
after initially operating
satisfactorily.
1, 8, 10, 15, 23
Loss of power in lift or
dipperstick cylinder, but
other cylinders function
properly.
22, 24, 28
Loss of power in any one
cylinder including lift and
dipperstick.
8, 9, 10, 11, 12, 13, 22, 23,
24, 25, 28
Loss of power or loss of
cushioning action in swing
cylinders, but other
cylinders function properly.
8, 9, 10, 11, 12, 13, 22, 23,
25
Maximum swing action
cannot be obtained.
10, 11, 12, 14, 30, 31
Slow operation of machine
(lack of power) all
cylinders.
1, 4, 6, 15, 23, 30
Spongy or jerky action of
cylinders and/or noisy
operation.
1, 3, 4, 5, 30
Lift dipperstick or bucket
cylinders drop under load
when lever spools are
shifted from neutral.
10, 11, 25, 26
Load settles. 8, 10, 13, 24, 25, 26
Leaky cylinders. 10, 11, 12, 13
Leaky valve. 8, 15, 16, 27
Sticky valve spool. 16, 19, 20, 21, 24, 33, 34
Unable to push valve
spool in.
16, 17, 20, 21, 29, 33, 34
Spring centered spools do
not return to neutral.
16, 17, 18, 19, 20, 21, 29
Handle develops
excessive play or no
longer aligns in center
position.
18, 19, 21, 25
POSSIBLE CAUSE CORRECTIVE ACTION
1 Low oil level in
reservoir.
Fill reservoir to proper
level
2 No oil supply to
machine.
Coupler not fully
engaged.
3 Air in system. Purge all circuits of air
by operating all cylinders
through full movements
several times. Check oil
in reservoir for foaming.
Check all suction lines for
leaks. Fill reservoir to
correct level.
4 Oil viscosity too heavy
or oil is not at
operating temperature.
Use recommended
hydraulic fluid. Run
machine until it reaches
operating temperature.
5 Pump not running. Check PTO to be sure it
is engaged. Check for
sheared key on pump
shaft.
6 Insufficient pumping. Advance engine throttle.
7 Improper hose
connection.
IMPORTANT: Be sure
inlet and return hoses are
hooked up correctly.
Improper hookup will
result in damage to
backhoe valve.
8 Loose hydraulic
connections, leaks in
fittings or hoses.
Tighten all hose
connections and replace
all damaged o-rings at
leaking o-ring fittings.
Check and replace any
damaged hoses.
9 Restrictions in fittings
or hoses.
Check and replace any
damaged hoses and
fittings. Check for
pinched hoses.
10 Oil is bypassing
cylinder piston.
Replace or rebuild
cylinder. Replace
damaged parts. Check if
piston is loose on shaft.
11 Scored piston rods or
worn rod guides in
cylinder.
Replace or rebuild
cylinder. Replace
damaged parts.
12 Bent piston rod in
cylinder.
Replace or rebuild
cylinder. Replace
damaged parts.
13 Worn or damaged rod
seals on cylinder.
External leaks.
Re-pack cylinder,.
Rebuild cylinder
replacing damaged parts
as necessary.
14 Swing linkage
jammed.
Remove interference.
15 Excessive back
pressure.
Restriction between
valve “out” port and
reservoir.
16 Paint on valve spool.
Sticking valve spool,
or scored valve.
Clean valve spool.
Binding may be caused
by over tightened plug,
mounting bolt, fitting or
tie rod bolt. See item 30.
MAINTENANCE
MAINTENANCE
© 2004 Alamo Group Inc.