Lull 6K Service Manual - Manual (Page 577)

Brakes
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 9-3
3. Remove the two (2) capscrews (Item 1), valve guard (Item 2), and gas
valve cap (Item 3) from the accumulator (Item 10) (see Fig. 9-2).
4. Mount accumulator test gauge (Item 5) to the accumulator gas valve
(Item 9). The pressure gauge must have a 2000 psi capacity (correctly
calibrated) with 5/16-32 UNEF mounting nut threads. Before installing
it, perform the following:
a. The bleed valve (Item 4) must be tightly closed (turned in).
b. The “T” handle (Item 8) must be backed out (counter clockwise).
c. Be sure of an air-tight connection when mounting the gauge.
d. The "T" handle must then be turned in after the pressure gauge is
mounted.
5. Mount brake pressure testing gauge to the brake test port located
behind the cab step (see Fig. 9-3). The gauge must have a 600 psi
capacity (correctly calibrated).
Fig. 9-3: Diagnostic Ports
6. Repeatedly pump (push, hold, release) the brake pedal until all brake
line pressure is depleted. The brake test gauge must read 0 psi.
7. Check to see if the accumulator test gauge (Item 5) now reads
375–425 psi. If pressure is correct, proceed to Step 8. If pressure is
incorrect, proceed to Step 15.
8. Start the engine and allow it to run (idle) throughout the remainder of
the bleeding and testing procedure. This will allow the accumulator to
maintain operating pressure.
PUMP 1 PUMP 2 CARR. TILT
(BASE END)
CARR. TILT
(ROD END) BRAKES STEERING PILOT ACCUM.
K
1067
Pressure
Testing Gauge
V
1079
Accumulator
Port
Brake
Port