HOUSING AS- 6I8192 - Caterpillar

Illustration 2 g06173805
Adjustable Boom Relief Valve
(L) Locknut
(A) Adjustment screwNote: Adjustment rate is approximately 80 bar per turn
Illustration 3 g06247541
Boom Lowering Control Valve
Required Tools
Illustration 4 g06173996
Tooling group "A"
439-5245 Hand Pump As
Table 2
Tool Part Number Description Qty
A 439-5245 Hand Pump As 1
Illustration 5 g01623868
Tooling group "B"
198-4240 Digital Pressure Indicator Gp
Table 3
Tool Item Part Number Description Qty
B 198-4240 Digital Pressure Indicator Gp
B1 198-4234 Indicator 1
B2 198-4239 Pressure Sensor
41300 kPa (6000 psi) 1
B3 198-4236 Extension Cable 1 Machine Preparation
Position the machine on level ground and stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".
Illustration 6 g06174040
Hydraulic schematic with tooling (A)
( A) Tooling (A)
( 1) Pressure tap
Install tooling (A) with pressure tap in the boom head-end circuit.
Attach tooling (B2) to pressure tap (1). Refer to Illustration 6.
Using tooling (A), increase and record the pressure on tooling (B).
To adjust the line relief, loosen the locknut and turn the adjustment screw until the pressure is within specification at pressure tap (1).Note: Turn the adjustment screw clockwise to increase the pressure setting. Turn the adjustment screw counterclockwise to decrease the pressure setting.Each full turn of the adjustment screw will result in approximately 8000 kPa (1160 psi) change.
Tighten the locknut on the line relief valve.Boom Lowering Control Valve Adjustment Procedure (If Equipped)
For machines with a Boom Lowering Control Valve, both the main valve line relief and BLCV line relief must be adjusted to the same pressure. The maximum allowable relief pressure setting for machines equipped with a Boom Lowering Control Valve is 35000 kPa (5076 psi).
Illustration 7 g06173558
(4) Red capNote: Line relief for the boom lowering control valve on the boom cylinder is beneath red cap (4).
Illustration 8 g06173553
Position the machine on level ground, lower the boom, and stop the engine.
Release the pressure in the hydraulic system. Refer to Testing and Adjusting, "System Pressure - Release".
Illustration 9 g06174123
Hydraulic schematic with tooling (A)
( A) Tooling (A)
( 1) Pressure tap
Install tooling (A) with pressure tap in the boom head-end circuit.
Attach tooling (B2) to pressure tap (1). Refer to Illustration 9.
Using tooling (A), increase and record the pressure on tooling (B).
To adjust the line relief, loosen the locknut and turn the adjustment screw until the pressure is within specification at pressure tap (1).Note: Turn the adjustment screw clockwise to increase the pressure setting. Turn the adjustment screw counterclockwise to decrease the pressure setting.Each full turn of the adjustment screw will result in approximately 16700 kPa (2422 psi) change.
Tighten the locknut on the line relief valve.