General Instructions; System Priming; Lubricant Pump - Komatsu 730E Operation & Maintenance Manual

OM4035.2 02/03
Automatic Lube System
LUBRICANT REQUIRED FOR SYSTEM
Grease requirements will depend on ambient tempera-
tures encountered during truck operation:
•Above 90°F (32°C) - Use NLGI No.2 multipurpose
grease (MPG).
•-25° to 90°F (-32° to 32°C) - Use NLGI No. 1 multipur-
pose grease (MPG).
•Below -25°F (-32°C) - Refer to local supplier for ex-
treme cold weather lubricant requirements.

SYSTEM PRIMING

The system must be full of grease and free of air pockets
to function properly. After maintenance, if the primary or
secondary lubrication lines were replaced, it will be
necessary to reprime the system to eject all entrapped
air.
1. Fill lube reservoir with lubricant, if necessary.
2. To purge air from the main supply line, remove the
main supply line at the pump outlet port (6, Figure
3-5) and connect an external grease supply to the
line.
3. Remove plugs from each injector group in sequence
(right front, left front, and rear axle).
4. Using the external grease source, pump grease
until grease appears at the group of injectors and
re-install the pipe plug. Repeat for remaining injec-
tor groups.
5. Remove the caps from each injector and connect
an external grease supply to the zerk on the injector
and pump until grease appears at the far end of the
individual grease hose or the joint being greased.

LUBRICANT PUMP

Pump Housing Oil Level
The pump housing must be filled to the proper level with
SAE 10W-30 motor oil. Oil level should be checked at
1000 hour intervals. To add oil, remove pipe plug (4,
Figure 3-5) and fill housing to bottom of plug hole.

GENERAL INSTRUCTIONS

Pump Pressure Control
High pressure hydraulic fluid from the truck steering
system is reduced to 325 to 350 psi (2 240 to 2 413 kPa)
by the pressure reducing valve located on the manifold
on top of the pump motor. This pressure can be read on
the gauge installed on the manifold and should be
checked occasionally to verify pressure is within the
above limits.
Pressure Control Valve Adjustment
1. With the truck engine running, install a jumper wire
across the "LUBE SW." and "SOL." terminals on the
lube timer under the passenger seat.
2. Loosen the locknut on the pressure control (1,
Figure 3-5) by turning the nut counterclockwise.
3. Turn the valve stem counterclockwise until it no
longer turns. (The valve stem will unscrew until it
reaches the stop - it will not come off.)
Note: This is the minimum pressure setting, which is
about 170 psi (1 172 kPa).
4. With the pump stalled against pressure, turn the
pressure control valve stem clockwise until 325 to
350 psi (2 240 to 2 413 kPa) is attained on the
manifold pressure gauge (3).
5. Tighten the locknut to lock the stem in position.
Note: The flow control valve (5) is factory adjusted to 2.5
GPM (9.5 L/min.). Do not change this setting.
1. Pump Pressure Control
2. Manifold
3. Pressure Gauge
Maintenance - Section 4
FIGURE 3-5. PUMP CONTROLS
4. Oil Level Plug
5. Flow Control Valve
6. Outlet Port
7. Manual Override
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