HYDRAULIC AR-3 VALVE 4520811 - Caterpillar

Illustration 9 g00500333
Note: When you install spool (35), avoid scratching the highly finished surfaces of spool (35) and the bore of upper valve body (12) .
Install slug (36) in spool (35). Install spool (35) in upper valve body (12) .
Install springs (34) and (33) in upper valve body (12) .
Install spacers (32) in upper valve body (12) .
Illustration 10 g00500330
Illustration 11 g00500329
Illustration 12 g00500328
Note: Spool (27) and spool (22) are located in the same bore of upper valve body (12). Spool (27) must be installed from the end opposite spool (22) .
Use the following procedure to install spool (27) in upper valve body (12) :
Turn upper valve body (12) to the opposite side and position upper valve body (12) on wood blocks, as shown. Make sure that pin (28) is clear of the bore.
Install slug (30), spring (29) and spool (28) in upper valve body (12) .
Use a screwdriver to slightly depress spool (27) .
Use a hammer and a punch to install pin (28) in the hole. Remove the screwdriver.
Illustration 13 g00500327
Install spring (23), spring (24), retainer (25) and retaining ring (26) on spool (22) .
Illustration 14 g00500322
Illustration 15 g00500299
Install spool (22) and spring (21) in upper valve body (12) .
Illustration 16 g00500298
Install one retainer (20), spring (19), one retainer (20) and retaining ring (18) on spool (17) .
Illustration 17 g00500296
Illustration 18 g00500294
Install spool (17) and stop (16) in upper valve body (12) .
Illustration 19 g00500292
Install O-ring seals, cover (15) and bolts (14) on upper valve body (12). Tighten the bolts to a torque of 30 7 N m (22 5 lb ft).
Illustration 20 g00500291
Install upper valve body (12) on plate (13) .
Illustration 21 g00500285
Install manifold (10) on upper valve body (12) .
Install 21 bolts (11) in manifold (10). Tighten the bolts to a torque of 30 4 N m (22 3 lb ft).
Illustration 22 g00500283
Install manifold (3) and wiring harness (9) on manifold (10) .
Install bolts (8) in manifold (3). Tighten the bolts to a torque of 30 4 N m (22 3 lb ft).
Install the bolts for the clamps that hold wiring harness (9) .
Install connector (7) on manifold (3) .End By: Install the transmission hydraulic control valve. Refer to Disassembly and Assembly, "Transmission Hydraulic Control Valve - Install" for the machine that is being serviced.