Komatsu 830E Shop Manual page 447

FIGURE 5-4. ACCUMULATOR MOUNTING
1. Accumulators
2. Clamps
Installation
The accumulator weighs approximately 310 lbs.
(140 Kg). Use a suitable lifting device that can
handle the load safely.
1. Attach a lifting device to the top section of the
accumulator. Accumulator should be positioned
in the lower mounting bracket with the anti-rota-
tion block positioned between the two stop
blocks.
2. Install mounting clamps (2, Figure 5-4) and
secure in place using capscrews, locknuts and
flatwashers. Tighten capscrews securely, but do
not overtighten as this may distort the accumu-
lator wall.
3. If the pressure switch (9, Figure 5-3) or valve
assembly (8) were removed, install at this time.
Connect electrical leads to the pressure switch.
Using a new O-ring, uncap and connect the
hydraulic line to the accumulator.
4. Precharge the accumulator with pure dry nitro-
gen to 1400 psi (9653 kPa) as outlined in the
"Steering Accumulator Charging Procedure".
NOTE: Permanent damage to accumulator bladder
will result if engine is started without accumulators
properly precharged.
L05026
3. Hoses (to Bleed-
down Manifold)
Steering Component Repair
Disassembly
1. Once the accumulator has been removed from
the equipment, the accumulator body should be
secured in a vise, preferably a chain vise. If a
standard jaw vise is used, brass inserts should
be used to protect the hydraulic port assembly
from damage. Clamp on wrench flats only
when using a jaw vise to prevent accumulator
from turning.
2. Remove bleeder plug (12, Figure 5-5) on
hydraulic port assembly.
wrench, remove locking ring (10) from the
hydraulic port assembly. Use an adjustable
wrench on the flats located on the port assem-
bly to prevent port assembly from rotating.
3. Remove spacer (9), then push the hydraulic port
assembly into the shell prior to Step 4.
4. Insert hand into the accumulator shell and
remove the O-Ring backup (8), O-Ring (7), and
metal backup washer (6). Separate the anti-
extrusion ring from the hydraulic port. Fold anti-
extrusion ring to enable removal of anti-extru-
sion ring from shell.
5. Remove hydraulic port from accumulator shell.
6. Secure bladder valve stem from twisting with an
appropriate wrench applied to the valve stem
flats and remove gas valve manifold (14). Then
remove nut (5) while still holding bladder valve
stem from turning.
7. Fold bladder and pull out of accumulator shell.
A slight twisting motion while pulling on the
bladder reduces effort required to remove blad-
der from shell. If bladder is slippery, hold with a
cloth.
Cleaning and Inspection
1. All metal parts should be cleaned with a clean-
ing agent.
2. Seals and soft parts should be wiped clean.
3. Inflate bladder to normal size. Wash bladder
with a soap solution. If soap solution bubbles,
discard bladder. After testing, deflate bladder
immediately.
4. Inspect assembly for damage; check the poppet
plunger to see that it spins freely and functions
properly.
5. Check anti-extrusion ring and soft seals for dam-
age and wear; replace all worn or damaged
seals with original equipment seals.
Using a spanner
L5-3