sem wheel loader part 5219660 Hollow bolts

Part Number: 5219660 Standard Name: Hollow Oil Bolt / Hinged Oil Pipe Bolt (Hollow Bolt for Hydraulic Pipes)
Compatible Brand: SEM (Category Caterpillar)
Related Parts: Compatible with your complete set of pneumatic/hydraulic accessories: 5217548 Oil-Water Separator Connector, 5360518 Brake Hoose, 5360555 Brake Copper Pipe, ZF 4WG200 Transmission Hydraulic Circuit Common Parts
II. Compatible Models
5-ton Wheel Loaders: SEM650B, 655D, 656D, 658F
Gradeers: SEM915, SEM918, SEM922 (equipped with ZF 4WG200 electronically controlled transmission)
III. Installation Location and Core Functions
1. Installation Points
Transmission valve body, brake interlock valve, oil-water separator, hydraulic oil distribution block, oil pipe hinge joint, used to fix hydraulic oil pipes, pneumatic copper pipes / 1. Hose.

2. Working Principle: The bolt rod has a through-hole in the center, securing the oil pipe joint on one side and allowing hydraulic oil/compressed air to flow on the other, achieving both fixing and fluid delivery in one unit, replacing the ordinary bolt + separate connector combination.

3. Failures (Easily Misdiagnosed as Transmission TCU Failure):

* **Blocked Bolt Hole:** Insufficient hydraulic/air flow, transmission brake interlock locks, vehicle cannot move forward or backward;
* **Stripped Threads, Worn Sealing Surface:** Oil/air leakage, continuous drop in air/oil pressure, weak brakes, no power shifting;
* **Deformed and Blocked Through-Hole:** No pressurized oil supply to the valve body, solenoid valve malfunctions, customers may mistakenly believe the TCU controller is damaged.

IV. Material, Specifications, and Operating Parameters

Material Strength: Forged 10.9 grade high-strength carbon steel, overall heat treated, galvanized for rust prevention, resistant to corrosion from engineering machinery hydraulic oil and mud/water (Alibaba listing...);

Structure: External hexagonal flange face, through hole in the center of the rod body, with matching sealing gaskets at both ends (matching pipeline gaskets sold as a set);

Pressure Bearing Capacity: Hydraulic oil circuit pressure resistance 32MPa, air circuit pressure resistance 1.0MPa, meeting the operating conditions of the ZF4WG200 gearbox hydraulic system;

Compatible Piping: Matches 5360555 brake copper pipe, 5360518 brake hose, 5217548 air circuit connector, complete set of piping dimensions.