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

Maintenance - Section 42
Page 42-8

GENERAL INSTRUCTIONS

LUBRICANT REQUIRED FOR SYSTEM

Grease requirements will depend on ambient tem-
peratures encountered during truck operation:
• Above 32°C (90°F)
multipurpose grease (MPG).
• -32° to 32°C (-25° to 90°F) - Use NLGI No. 1
multipurpose grease (MPG).
• Below -32°C (-25°F) - Refer to local supplier for
extreme 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 prime the system to eject all
entrapped air.
1. Fill lubrication reservoir with lubricant, if neces-
sary.
2. To purge air from the main supply line, remove
the main supply line at outlet port (6, Figure 42-
7) 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 an external grease source, pump grease
until grease appears at the group of injectors
and re-install the pipe plug. Repeat for remain-
ing injector groups.
5. Remove the caps from each injector and con-
nect 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.
- Use NLGI No.2
Automatic Lubrication System

LUBRICANT PUMP

Pump Housing Oil Level

The pump housing must be filled to the proper level
with SAE 10W-30 motor oil. Oil level must be
checked at 1000 hour intervals. To add oil, remove
dipstick (8, Figure 42-7) and fill housing to bottom of
plug hole.
NOTE: If the pump does not have a dipstick, use the
oil fill plug hole to add oil and check the oil level.

Pump Pressure Control

High pressure hydraulic fluid from the truck steering
system is reduced to 2 240 to 2 413 kPa (325 to 350
psi) 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 must be checked occasionally to verify pressure
is within the above limits.
FIGURE 42-7. PUMP CONTROLS
1. Pressure Reducing
Valve
2. Pump Control Mani-
fold
3. Pressure Gauge
(Optional)
07/09 0M4211
4. Oil Level Plug
5. Flow Control Valve
6. Grease Outlet
7. Manual Override
8. Dipstick