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Installation of the 172-9321 Metering Pump for the Steering System{4312} Caterpillar


Installation of the 172-9321 Metering Pump for the Steering System{4312}

Usage:

D250E II 4PS
Articulated Truck:
D250E Series II (PIN: 4PS1-458)
D300E Series II (PIN: 5KS1-401)

Introduction

This Special Instruction provides detailed instructions on the installation of the new improved 172-9321 Metering Pump which is a direct replacement for the former 160-8008 Metering Pump .

The 160-8008 Metering Pump required external check valves for protecting system components from cavitation. The new 172-9321 Metering Pump has check valves which have been installed within the unit. The external check valves need to be removed. This will prevent interactions between the two sets of check valves.

Remove the following components

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Table 1
Quantity     Part Number     Part Description    
1     160-8008     Metering Pump    
2     7X-0871     Tee    
2     165-7948     Check Valve    
2     9T-6663     Adapter    
1     2T-2264     Hose Assembly    
1     6V-9836     Swivel Tee    
1     6V-9850     Swivel Elbow    
2     5P-7462     Clip    
2     5P-7463     Clip    
2     6V-0683     Grommet    
1     6V-9850     Swivel Elbow    
1     6V-9796     Elbow    
1     6V-8941     Reducer    
1     9X-6580     O-Ring Seal Nut    
1     151-2500     Hose Assembly    

Removal Procedure

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------ WARNING! ------

At operating temperature, the hydraulic tank is hot and under pressure.

Hot oil and components can cause personal injury. Do not allow hot oil or components to contact skin.

Remove the filler cap only when the engine is stopped, and the filler cap is cool enough to touch with your bare hand. Remove the filler cap slowly in order to relieve pressure.

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NOTICE

Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.

Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products.

Dispose of all fluids according to local regulations and mandates.

Note: Turn off the engine. Apply the foot brake several times in order to relieve the pressure in the brake system. Turn the steering wheel in order to relieve the pressure in the metering pump. Remove the hydraulic filler cap slowly in order to relieve the pressure in the hydraulic tank.

  1. Pull the hood release lever in the cab. Open the engine hood and engage the hood latch.

  1. Put identification marks on all lines, hoses, wires and tubes for installation purposes. Plug all lines, hoses and tubes. This helps prevent fluid loss and contamination of the oil system.
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    Illustration 1g00453392

  1. Loosen retaining nut (1) and disconnect hydraulic hose (2) from 160-8008 Metering Pump (3).
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    Illustration 2g00453394

  1. Loosen four retaining nuts (4) and disconnect four hydraulic hoses (5) from the metering pump.
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    Illustration 3g00453430

  1. An individual outside of the cab must hold the metering pump. Remove four mounting bolts (6) and the washers around the steering column in the cab that secure the metering pump to the cab. Remove the metering pump from the cab. Remove all fittings and connectors which may be needed when the new metering pump is installed.
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    Illustration 4g00461308

  1. Remove four spacers (7) from the mounting bracket.
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    Illustration 5g00686257

  1. Loosen retaining nut (9) and disconnect the 151-2500 Hose Assembly (8) from 6V-9836 Swivel Tee (10) at the left side steering cylinder.

  1. Loosen retaining nut (12) and disconnect the 2T-2264 Hose Assembly (11) from 6V-9850 Swivel Elbow (13) .
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    Illustration 6g00686258

  1. Loosen retaining nut (15) and disconnect hose (14) from 7X-0871 Tee (16) .

  1. Loosen retaining nut (17) and remove 7X-0871 Tee (16), 165-7948 Check Valve (19), 9T-6663 Adapter (20), 6V-9836 Swivel Tee (10), and 6V-9850 Swivel Elbow from elbow (18) .
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    Illustration 7g00686253

  1. Loosen retaining nut (21) and disconnect 2T-2264 Hose Assembly (11) from the 9T-6663 Adapter (22) at the right side steering cylinder.

  1. Loosen retaining nut (27) and disconnect hose (28) from 7X-0871 Tee (26) .

  1. Loosen retaining nut (25) and remove 7X-0871 Tee (26), 165-7948 Check Valve (23), and 9T-6663 Adapter (22) from elbow (24) .

  1. Remove two 5P-7462 Clips , two 5P-7463 Clips , and two 6V-0683 Grommets which retain the 2T-2264 Hose Assembly (11) .

  1. Remove hose assembly (11) .
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    Illustration 8g00686262

  1. Loosen retaining nut (36) and disconnect the 151-2500 Hose Assembly (8) from the 148-8367 Elbow at the hydraulic tank.

  1. Remove hose assembly (8) .

  1. Loosen retaining nut (30) and disconnect hose (29) from 148-8449 Swivel Tee (31) .

  1. Loosen retaining nut (32) and remove the 148-8449 Swivel Tee (31), 148-8417 Reducer (34), and 148-8367 Elbow (35) from check valve (33) .

Installation Procedure

  1. Clean all parts and inspect all parts. If any parts are worn or damaged, use new Caterpillar parts for replacement.
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    Illustration 9g00686307

  1. Connect hose (29) to check valve (33). Tighten retaining nut (30) .
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    Illustration 10g00686362

  1. Connect hose (28) to elbow (24) at the right side steering cylinder. Tighten retaining nut (27) .
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    Illustration 11g00686381

  1. Connect hose (14) to elbow (18) at the left side steering cylinder. Tighten retaining nut (15) .
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    Illustration 12g00461308

  1. Install four spacers (7) to the mounting bracket.
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    Illustration 13g00453430

  1. Install all fittings and connectors that were removed from the old metering pump. Position the new 172-9321 Metering Pump . An individual outside of the cab must hold the metering pump. Install four mounting bolts (6) and the washers around the steering column in the cab that secure the metering pump to the cab.
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    Illustration 14g00453394

  1. Connect four hydraulic hoses (5) to the metering pump. Tighten four retaining nuts (4) .
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    Illustration 15g00453392

  1. Connect hydraulic hose (2) to the 172-9321 Metering Pump (3). Tighten retaining nut (1) .

  1. Check the oil level in the hydraulic tank. Refer to Operation and Maintenance Manual, SEBU7028, "Hydraulic System Oil Level- Check".

  1. Start the engine and steer the machine from the left side lock to the right side lock.

  1. Recheck the oil level in the hydraulic tank and check for oil leaks.

  1. Release the hood latch. Close the engine hood.

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