TM 5-2420-231-23-1
0073
Table 1. Multiple Backhoe Operations (Pilot Controls) Do Not Function Correctly - Continued.
073
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. Using a digital multimeter, mea-
Multiple Backhoe
Resistance 5.0 Ohms or Less -
sure resistance between control
Replace right-hand tower wiring
Operations (Pilot Controls)
pattern switch (WP 0007, Figure
harness (WP 0188).
Do Not Function Correctly -
166) terminals 2 and 3. Resistance
Proceed to Test Step 29.
Continued
should be 5.0 ohms or less.
Resistance Greater Than 5.0 Ohms -
Replace control pattern switch (WP
0189).
Proceed to Test Step 29.
Figure 4. Control Pattern Switch.
0073
Test Step 21. Set Up and Test
Pressure Reducing Valve.
Perform pilot pressure test (WP 0086).
Pilot Pressure Within Specification
Pressure reading should be 350 to 550
of 350 to 550 psi (2,413 to 3,792 kPa)
psi (2,413 to 3,792 kPa).
- Disconnect hose and pressure gauge
from machine.
Proceed to Test Step 22.
Pilot Pressure Out of Specification of
350 to 550 psi (2,413 to 3,792 kPa) -
Disconnect hose and pressure gauge
from machine.
Replace pilot control valve (WP 0264).
Proceed to Test Step 29.
