Hydraulic Tank; Filling Instructions - Komatsu 930E-2 Shop Manual

HYDRAULIC TANK

Filling Instructions

NOTE: If filling is required, use only type C-4 hydraulic
oil as specified on the truck Lubrication Chart. Filtering
of oil with a 3 micron filtering system is recommended.
Prior to opening the hydraulic tank, allow at least
90 seconds for the accumulator to bleed down
after engine shutdown and keyswitch "Off".
1. With the engine stopped, body down, and the key
switch "Off", wait for at least 90 seconds.
2. Remove the fill cap (1, Figure 3-18) and add clean
type C-4 hydraulic oil until oil is at the top sight
gauge.
3. Replace fill cap.
4. Start engine, raise and lower the dump body three
times.
FIGURE 3-18. HYDRAULIC TANK
1. Fill Cap
2. Sight Gauges
L3-14
3. Breather Filters (2)
4. Drain Valve
5. Drain Cocks
Hydraulic Component Repair
5. Continue to repeat steps 1 thru 4 until oil level is
maintained in the top sight gauge with the engine
stopped, key switch "Off", and body down.
NOTE: With engine running and oil at operating tem-
perature, the oil should be visible in the lower sight
glass. If not, shut down engine and add oil per "Filling
Instructions".
NOTE: Minor adjustments to oil level can be made by
using the drain cocks (5) next to filler neck.
Should a component fail in the hydraulic system,
an oil analysis should be made before replacing
any component. If foreign particles are evident,
system must be flushed. Refer to "Hydraulic Sys-
tem Flushing" instructions.
Removal
1. Turn keyswitch "Off" and allow at least 90 seconds
for the steering accumulator to bleed down.
NOTE: Be prepared to contain approximately 250 gal.
(947 L) of hydraulic oil. If the oil is to be reused, clean
containers must be used with a filtering (3 micron)
system available for refill.
2. Thoroughly clean the outside of the hydraulic tank
and attached equipment.
3. Drain the hydraulic tank by use of the drain valve
located on the rear side of the tank.
4. Disconnect hydraulic lines. Plug lines to prevent
possible contamination to the system. Tag each
line at removal for proper identification during
installation.
Take care to avoid contact with hot oil if truck has
been operating. Avoid spillage and contamination.
5. Attach a lifting device to the hydraulic tank.
6. Remove the capscrews and lockwashers securing
the hydraulic tank to the frame.
7. Move hydraulic tank to a clean work area for
disassembly or repair.
L03027