Hydraulic Tank Strainers; Strainer Removal - Komatsu 930E-2 Shop Manual

Installation
1. Install hydraulic tank and secure with capscrews
and lockwashers. Tighten to 459 ft. lbs. (622
N.m) torque.
2. Uncap hydraulic lines and attach to the proper
connections.
3. Replace breather filters if required.
4. Fill the hydraulic tank with clean, filtered C-4 hy-
draulic oil. Refer to "Filling Instructions".
5. Bleed all air from hydraulic lines.
6. Bleed trapped air inside steering pump. Refer to
" Pump Pressure Setting", Section "L" for air
bleeding procedure.
NOTE: If trapped air is not bled from steering pump,
possible pump damage and no output may result.

HYDRAULIC TANK STRAINERS

Removal
Prior to opening the hydraulic tank, allow at least
90 seconds for the accumulators to bleed down
after engine shutdown with the key switch "Off".
1. Shut down the engine and the key switch "Off" for
at least 90 seconds.
FIGURE 3-19. STRAINER REMOVAL
1. Hydraulic Tank
2. Cover
3. Capscrews & Lockwashers
L03027
4. Shutoff Valve
5. Pump Suction
Hoses
Hydraulic Component Repair
NOTE: If the oil is to be reused, clean containers must
be used with a filtering (3-micron) system available for
refill.
2. Be prepared to contain approximately 250 gal.
(947 l) of hydraulic oil. Drain hydraulic oil from
tank.
3. Disconnect pump suction hoses. (5, Figure 3-19).
4. Remove capscrews and lockwashers (3) securing
cover (2) to the hydraulic tank. Remove and dis-
card gasket.
5. Remove capscrews and lockwashers securing
suction strainers. Remove suction strainers.
Inspect and Clean
NOTE: Inspect the strainers thoroughly for metallic
particles and varnish build up (if oil has been over-
heated). The quantity and size of any particles may be
an indication of excessive wear of components in the
hydraulic system.
1. Clean the strainers with fresh cleaning solvent from
the inside out.
2. Inspect the strainers for cracks or wear. Replace,
if necessary.
3. Clean any sediment from bottom of hydraulic tank.
Installation
1. Install suction strainers and secure in place with
capscrews and lockwashers. Tighten capscrews
to standard torque.
2. Using new cover gasket move cover (2, Figure
3-19) into place and install capscrews and lock-
washers (3). Tighten capscrews to standard
torque.
3. Install pump suction hoses.
4. Fill the hydraulic tank; refer to Hydraulic Tank
Filling Instructions. Open both suction line shut-
off valves (4).
5. Loosen suction line connections at both pumps to
bleed any trapped air. Tighten hose connections.
6. Bleed trapped air inside steering pump. Refer to
"Steering and Brake Pump Installation", this Sec-
tion, for air bleeding procedure.
NOTE: If trapped air is not bled from steering pump,
possible pump damage and no output may result.
L3-15