ENGINE AR-COMPLETE 3501690 - Caterpillar

Illustration 1 g01437020
Travel brake valve (1) Crossover relief valve (2) Passage (3) Spring (4) Valve (5) Port (6) Passage (7) Passage (8) Passage (9) Valve (10) Spring (11) Passage (12) Port (13) Crossover relief valve (14) Ball (15) Valve (16) Chamber (guide) (17) Orifice (18) Spring chamber (19) Spring (20) Passage (21) Passage (22) Check valve (23) Port (24) Passage (25) Passage (26) Passage (27) Port (28) Check valve (29) Passage (30) Spring (31) Orifice (32) Brake pilot valve (33) Travel brake valve (34) Counterbalance valveEach travel motor contains a travel brake valve. The travel brake valve consists of counterbalance valve (34) and two crossover relief valves (1) and (13) .The travel brake valve is bolted to the travel motor. The travel brake valve prevents the occurrence of a shock load during a travel stop. The travel brake valve also prevents cavitation and overrun. The travel brake valve sends oil to the parking brake in order to release the brake. This occurs before the start of the machine movement.Counterbalance Valve
Level Travel
Illustration 2 g01125169
Travel motor and travel brake valve (left track) (1) Crossover relief valve (13) Crossover relief valve (23) Port (27) Port (33) Travel brake valve (34) Counterbalance valve (35) Left travel motorCounterbalance valve (34) consists of the following components:
valve (15)
spring (19)
check valve (22)
check valve (28)
spring (30) During forward travel, pump oil flows through port (23) and into passage (24). The oil flows through passage (24) and into valve (15). Check valve (22) opens. The oil now flows through passage (2) and passage (5). The oil flows into the piston of the travel motor. The oil then powers the travel motor.A portion of the pump oil in port (23) flows through passage (21) and into spring chamber (18). The oil then flows through passage (20) and into chamber (16). The oil in spring chamber (18) and chamber (16) shifts valve (15). Valve (15) shifts to the right against the force of spring (30). Passage (8) opens.The motor return oil flows through port (12), passage (11), passage (8), passage (26) and out port (27). The oil now flows back to the tank.When oil flow from port (23) is blocked, there is a pressure decrease in chamber (18) and chamber (16). Spring (30) forces