Wiper Arm May Interfere with Boom Tube Clamp on Certain Mini Hydraulic Excavators {5057} Caterpillar

Mini Hydraulic Excavator

303.5E2 (S/N: BG81-UP; JWY1-UP)

304E2 (S/N: CJ21-UP; ME41-UP)

305.5E (S/N: MX51-UP)

305.5E2 (S/N: CR51-UP; EJX1-UP)

305E2 (S/N: H5M1-UP)

305E2 CR (S/N: DJX1-UP)

Introduction

The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the interim solution that is identified below.

Problem

The above listed Mini Hydraulic Excavators equipped with the 432-4559 Window Wiper Group may have an interference with the 436-7870 Clamp used to secure the auxiliary hydraulic tubes. The interference may damage the wiper blade and/or the front window to break in hard power-up function.

Solution

The parts listed in Tables 1 and 2 are required to reposition the boom tube brackets.

To improve the clearance between the boom tube clamps and the wiper arm, the tubes on the boom can be modified.

Illustration 1	g06037447
(A) Excess bracket material

Illustration 2	g06037467
(A) Excess bracket material (B) 14 ± 1 mm (0.551 ± 0.040 inch)

Illustrations 1 and 2 show the locations of excess bracket material. By removing 14 ± 1 mm (0.551 ± 0.040 inch) of excess bracket material (A) from each boom bracket will allow for acceptable clearance.