Accumulator Installation - Komatsu 930E-2 Shop Manual

ACCUMULATORS
Removal
1. Insure key switch has been "Off" for at least 90
seconds to allow accumulator oil to drain back to
tank. Move steering wheel to be certain all pres-
surized oil is released.
2. Remove charging valve guard (3, Figure 6-2) and
loosen small hex on charging valve (4) three
complete turns. Depress the valve core until all
nitrogen pressure has been relieved.
Make certain only the small swivel hex nut turns.
Turning the complete charging valve assembly
may result in the valve assembly being forced out
of the accumulator by the nitrogen pressure in-
side. Wear protective face mask when discharging
nitrogen gas.
3. Remove oil line from bottom of the accumulator.
Plug all hoses and openings to prevent possible
contamination of the system. Disconnect and
mark electrical wiring to pressure switch.
4. Attach a lifting device to the accumulator to be
removed.
5. Loosen the mounting band (3, Figure 6-3) cap-
screws and remove the mounting bands.
6. Raise the accumulator until clear of mounting
bracket and move to a clean work area for disas-
sembly.
Installation
1. Lift accumulator into position on the mounting
bracket. Accumulator should be positioned with
the antirotation block positioned between the two
stop blocks on the lower mounting bracket.
2. Secure the accumulator to the mounting bracket
using mounting bands (3, Figure 6-3), capscrews,
lockwashers and nuts. Do not overtighten nuts, as
this could distort the accumulator.
3. If pressure switches were removed, install at this
time. Connect electrical wiring to pressure
switches and reconnect oil line to the bottom of
the accumulator.
4. Precharge both accumulators with pure dry nitro-
gen as outlined in "Steering Accumulator Charg-
ing Procedure".
L6-2
1. Accumulator
2. Pressure Switch Cover
FIGURE 6-3. ACCUMULATOR INSTALLATION
1. Accumulator
2. Pressure Switch
Steering Circuit Component Repair
FIGURE 6-2. CHARGING VALVES
3. Charging Valve Guard
4. Charging Valve
3. Mounting Band
L06021