Piston Pump (Brake, Hydraulic Fan)
254-5146 Piston Pump
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| Illustration 1 | g02921657 |
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| Specification for 254-5146 Piston Pump | |||
| Item | Qty | Part | Specification Description |
| 1 | 1 | 9S-8002 O-Ring Plug | Torque to 15 N·m (133 lb in). |
| 2 | 1 | 194-9472 Spring | Free length is 53 mm (2.1 inch). |
| 3 | 1 | 198-5351 Plug | Torque to 190 N·m (140 lb ft). |
| 4 | 1 | 9S-8005 O-Ring Plug | Torque to 72 N·m (53 lb ft). |
| 5 | 4 | 8T-9515 Bolt | Torque to 51 N·m (38 lb ft). |
| 6 | 1 | 194-9481 Thrust Disc | Thickness of new thrust disc is 2.0 mm (0.08 inch). |
| 7 | 1 | 155-9117 Spring | Free length is 58 mm (2.3 inch). |
| 8 | 1 | 191-7582 Shim | In order to achieve the thickness (B) of 0.00 to 0.05 mm (0.000 to 0.002 inch) grind the shim with faces parallel within 0.05 mm (0.002 inch): Thickness of new shim is 2.5 mm (0.10 inch). |
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| Item | Qty | Part | Specification Description |
| - | - | - | Pump Specification: |
| Direction of pump rotation is counterclockwise. | |||
| Maximum pump displacement for per revolution is 28.0 cc (1.7 cubic inch). |
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| High-pressure cutoff is 19388 ± 350 kPa (2812 ± 51 psi). |
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| Margin pressure is 1800 ± 100 kPa (261 ± 15 psi). |
Bench Test
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| Item | Qty | Part | Specification Description |
| - | - | - | Connect the load sensing port to the pump discharge port before testing. The pressure at the load sensing port will be equal to the discharge pressure. |
| - | - | - | The pump output is for a new pump that is using SAE 10W oil at an approximate temperature of 50 °C (122 °F). |
| - | - | - | Pump performance at 690 kPa (100 psi) discharge pressure: Output is 55 L/min (15 US gpm). Pump speed is 2000 rpm. |
| - | - | - | Pump performance at 6900 kPa (1000 psi) discharge pressure: Output is 53 L/min (14 US gpm). Pump speed is 2000 rpm. |
Machine Test
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| Item | Qty | Part | Specification Description |
| - | - | - | Disconnect the solenoid for the demand fan before testing. The pressure at the load sensing port will be equal to the discharge pressure. |
| - | - | - | The pump output is for a new pump that is using SAE 10W oil at an approximate temperature of 50 °C (122 °F). |
| - | - | - | Fan speed is 1260 ± 25 rpm. |
| - | - | - | Pump output is 41 L/min (11 US gpm). |
| - | - | - | Discharge pressure is 15500 kPa (2248 psi). |
| - | - | - | Pump speed is 1760 rpm. |
| - | - | - | Engine speed is 1760 rpm. |
207-0697 Pump Control Valve Gp
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| Illustration 2 | g02921658 |
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| Specification for 207-0697 Pump Control Valve Gp | |||
| Item | Qty | Part | Specification Description |
| 9 | 2 | 6E-6539 Cap Nut | Torque to 21 N·m (186 lb in). |
| 10 | 2 | 6E-6538 Adjustment Nut | Torque to 21 N·m (186 lb in). |
| 11 | 1 | 6E-3276 Spring | Length under test force is 32.6 mm (1.28 inch). Test force is 462 ± 71 N (104 ± 16 lb). Free length after test is 35.6 mm (1.40 inch). |
| 12 | 1 | 6E-3275 Spring | Length under test force is 15.1 mm (0.59 inch). Test force is 40.2 ± 2.8 N (9.0 ± 0.6 lb). Free length after test is 20.5 mm (0.81 inch). |
| 13 | 1 | 193-1036 Spring | Free length is 31.1 mm (1.22 inch). |
| 14 | 1 | 6E-3274 Spring | Length under test force is 14.4 mm (0.57 inch). Test force is 81.7 ± 14.5 N (18.4 ± 3.3 lb). Free length after test is 15.9 mm (0.63 inch). |
| 15 | 2 | 6E-6527 Plug | Before assembly, apply blue Loctite 242 to the threads. |
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