Komatsu 930E-2 Shop Manual page 490

Removal
1. With the key switch "Off" allow at least 90 seconds
for the accumulators to bleed down.
2. Remove plug (10, Figure 9-2), loosen bleed plug
(4) and drain oil from the housing into a suitable
container.
Take care to avoid contact with hot oil if truck has
been operating. Avoid spillage and contamination!
3. Remove bowl (8) and element (7).
4. Remove and discard O-ring (6) on filter bowl.
5. Clean bowl in solvent and dry thoroughly.
Installation
1. Install new element (7). Install new O-ring (6) on
bowl.
2. Install bowl on filter head and tighten.
3. Install drain plug (10), and O-ring (9). Tighten bleed
plug (4).
INDICATOR SWITCH
The indicator switch (1, Figure 9-2) is factory preset to
actuate at 35 psid (240 kPa). The switch and warning
light should be routinely tested as a part of the regular
vehicle maintenance program. Refer to "Indicator
Switch Test Procedure".
L9-4
INDICATOR SWITCH
The hydraulic filter indicator switch is factory preset to
actuate at 35 psid (240 kPa). Switch adjustment is not
necessary or recommended, however the switch and
warning lamp should be tested periodically for proper
operation. The indicator switch is not repairable and if
inoperative, replace switch assembly.
Figure 9-3 shows a pressure switch tester and Figure
9-4 shows a test block to accept the switch during
testing. The test block may be fabricated as shown.
Test Procedure
1. With the key switch "Off" allow at least 90 seconds
for the accumulators to bleed down.
2. Disconnect wiring harness and remove switch
from filter head.
3. Install switch in test block. Connect pressure tester
to pipe nipple. Reconnect wires to switch.
4. Turn key switch on. Pump up pressure to test block
while observing tester gauge and hydraulic oil filter
warning light in cab. Light should turn on at 35 ± 5
psi (240 ± 34.5 kPa). If not, test bulb and switch as
follows:
a. If lamp fails to light, remove wire (circuit # 39)
from switch and short to ground. If warning
lamp does not light, replace bulb.
b. If lamp lights when wire # 39 is grounded in
previous step, use an ohmeter to verify switch
contacts close at 35 psi (240kPa).
5. If switch contacts fail to close, replace switch
assembly.
NOTE: The hydraulic filter warning lamp may be acti-
vated by either the hoist or steering/brake circuit filter
indicator switch.
Hydraulic System Filters L09008