System Components; Filter Assembly; Hydraulic Motor And Grease Pump; Reservoir - Komatsu 730E Operation & Maintenance Manual

Maintenance - Section 42
Page 42-2
FIGURE 42-2. STEERING CYLINDER AND TIE
ROD INJECTORS
1. Steering Cylinder/Tie
Rod Injectors
2. To Steering Cylinder
Cap End

SYSTEM COMPONENTS

Filter Assembly

Filter assembly (14, Figure 42-3) filters the grease
prior to refilling reservoir (6) from the shop supply.
Dirty filter indicator (13) alerts service personnel
when the filter requires replacement.

Hydraulic Motor and Grease Pump

Hydraulic motor and grease pump (16 & 4, Figure
42-3) is a hydraulically operated grease pump. Inte-
grated pump control manifold (4, Figure 42-1) is
incorporated with the motor to control input flow and
pressure.
NOTE: The pump crankcase oil level must be
maintained to the level of oil fill plug (22, Figure 42-
3). If necessary, refill with 10W-30 motor oil.
3. To Steering Cylinder
Rod End
4. Supply From Pump
5. To Tie Rod
Automatic Lubrication System
Hydraulic inlet pressure must not exceed 20685
kPa (3000 psi). Exceeding the rated pressure may
result in damage to system components and pos-
sible personal injury.
Specifications are as follows:
Maximum hydraulic oil inlet pressure:
. . . . . . . . . . . . . . . . . . . . . . . 20 685 kPa (3,000 psi)
Hydraulic oil operating pressure:
. . . . . . . . . . . . . . . . . 2 240-2 415 kPa (325-350 psi)
Hydraulic inlet flow:
. . . . . . . . . . . . . . . . . . . . . . up to 28 L/min. (7 GPM)
Pump ratio:
. . . . . . . . . . . . . . approx. 9:1 @ 2 068 to 2 415 kPa
(300 to 350 psi) oil pressure = less than 7 L/min.
(2 GPM) flow
Operating temperature:
. . . . . . . . . . . . . . . . . . -10 to +65°C (-20 to +150°F)

Reservoir

Reservoir (6) has an approximate capacity of 97 kg
(214 lbs) of grease. When the grease supply is replen-
ished by filling the system at the service center, the
grease is passed through filter assembly (14) to
remove contaminants before it flows into the reservoir.

Fixed Pressure Reducing Valve

Pressure reducing valve (12, Figure 42-3), located on
the manifold, is preset and reduces the hydraulic supply
pressure from the truck steering circuit to a suitable
operating pressure of 2 241 - 2 413 kPa (325 - 350 psi)
for the hydraulic motor used to drive the lubricant pump.
The pressure reducing valve has a fixed pressure
setting and must not be changed.
Flow Control Valve
Flow control valve (23, Figure 42-3), mounted on the
manifold, is preset and controls the amount of oil flow
to the hydraulic motor at 9.5 L/min (2.5 gpm).
The flow control valve has a fixed pressure setting
and must not be changed.
07/09 0M4211