TRACK SHOW 0803645 - Caterpillar

Bench Test
If the test bench can be run at 6900 kPa (1000 psi) and at full pump rpm, find the percent of flow loss using Formula I.If the test bench cannot be run at 6900 kPa (1000 psi) and at full pump rpm, run the pump shaft at 1000 rpm. Measure the pump flow at 690 kPa (100 psi) and at 6900 kPa (1000 psi). Use these values in the top part of Formula II. For the bottom part of the formula, run the pump shaft at 2000 rpm. Measure the pump flow at 690 kPa (100 psi). Vibratory Frequency Test
The oil in the system must be ISO 3448 type VG 46. The oil must be certified to have anti-rust, very high viscosity index, and anti-oxidation additive properties for heavy duty use. The oil temperature must be 60 3°C (140 5°F) to get correct results. All frequency tests are made with the engine rpm at maximum 2510 rpm.Tests must be carried out on a material which has been compacted to a reasonable density or on tires.Vibratory frequencies that are the same as those given below are an indication that the circuit operation is normal. The relief valves for both over-run and main line circuit must be tested to be sure that the opening pressure of each is correct. The maximum frequency values shown below are examples only. Actual values during the test may vary from those shown due to engine, hydraulic components and ground conditions. However, the difference in vibrations per minute (vpm) at each amplitude setting should be as shown.Dual Drum Frequency, Forward And Reverse Travel Motion Test
Maximum frequency at ... 3600 vpmSingle Drum Frequency Forward And Reverse Travel Motion
Maximum frequency at ... 3600 vpmPressure Test Tools
The 4C4892 Fittings Group can be used to make pressure tests on the machine systems. Before any tests are made, visually inspect the complete hydraulic systems for leakage of oil and for parts that are damaged.Use the above pressure gauge kit for all of the pressure tests that follow. In some procedures, more than one of the same pressure gauge is required. It may be necessary to use two pressure gauge kits. Also included in the above chart are any other required tools for the following pressure tests.When any test is made of a machine system, the hydraulic oil must be at the normal temperature for operation. The oil temperature must be 60 3°C (140 5°F) to get correct results.Vibratory Hydraulic Tests
Vibratory Test Schematic
Vibratory relief valves
(A) Main relief. (B) anti-lope relief valve. (C) relief valve.Main Relief Valve Pressure Test
Refer to the on the first page of Troubleshooting.
Vibratory Control Valve Group.
(1) Main relief valve (A) (Refer to vibratory test schematic). (2) Pressure tap.1. Tests must be carried out on a material which has been compacted to a reasonable density or on tires.2. Make sure that the parking brake is applied. Be sure that the propulsion control lever is in neutral.3. Connect pressure gauge to pressure tap (2).3.