System Checkout; Lubrication Cycle Timer Check - Komatsu 730E Operation & Maintenance Manual

Maintenance - Section 42
Page 42-12

SYSTEM CHECKOUT

To check system operation, not including the timer,
proceed as follows:
1. Start the engine.
2. Actuate the test switch at the reservoir/pump
assembly.
3. The motor and pump will operate until the sys-
tem attains 20 685 kPa (3,000 psi).
4. Once the required pressure is achieved, the
pump motor will turn off and the system will
vent.
5. Check for pump, hose, or injector damage or
leakage when the system is pressurized.
6. After checking the system, shut the engine off.
Observe normal precautions regarding high
voltage present in the propulsion system before
attempting to repair the lubrication system.

Lubrication Cycle Timer Check

FIGURE 42-11. LOCATION OF LUBRICATION
CYCLE TIMER
1. Cab Interface
Compartment
2. Lubrication Cycle
Timer
Automatic Lubrication System
To check the solid-state timer operation without wait-
ing for the normal timer setting, proceed as follows:
NOTE: The timer incorporates a liquid and dust-tight
cover which must be in place and secured at all times
during truck operation.
1. Remove the dust cover.
2. Adjust timer selector (3, Figure 42-12) to the
five minute interval setting
.
FIGURE 42-12. LUBRICATION CYCLE TIMER
(Shown With Cover Removed)
1. Timer Enclosure
2. Red LED
3. The timer must cycle in five minutes if the truck
is operating.
NOTE: If the timer check is being made on a cold
start, the first cycle will be approximately double the
nominal setting. All subsequent cycles must be within
the selected time tolerance.
4. Perform voltage checks at the timer if the above
checks do not identify the problem.
a. Ensure that the timer ground connection is
clean and tight.
b. With the key switch on, use a voltmeter to
read the voltage between the positive and
negative posts on the solid-state timer. A nor-
mal reading must be 18 to 26VDC, depend-
ing upon whether the engine is on or not.
07/09 0M4211
3. Timer Selector