| Узел | Модель |
| (H11) - HYDRAULIC VALVES INTRODUCTION, ALWAYS FURNISH SERIAL NUMBER | (40EC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H12) - HYDRAULIC VALVES INTRODUCTION (CONT'D), MAIN VALVE BANK | (40EC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H13) - HYDRAULIC VALVES INTRODUCTION (CONT'D), MAIN VALVE BANK | (40EC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H14) - HYDRAULIC VALVES INTRODUCTION (CONT'D), MAIN VALVE BANK | (40EC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H14A) - HYDRAULIC VALVES INTRODUCTION (CONT'D) | (40EC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H16) - WORKING SECTION PART NUMBER 208688M1, (USED ON UNITS WITH | (40EC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H24) - MID SECTION PART NUMBER 207115M1, (USED ON UNITS WITH SERIAL | (40EC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H11) - HYDRAULIC VALVES INTRODUCTION, ALWAYS FURNISH SERIAL NUMBER | (40YC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H12) - HYDRAULIC VALVES INTRODUCTION (CONT'D), MAIN VALVE BANK | (40YC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H13) - HYDRAULIC VALVES INTRODUCTION (CONT'D), MAIN VALVE BANK | (40YC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H14) - HYDRAULIC VALVES INTRODUCTION (CONT'D), MAIN VALVE BANK | (40YC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H14A) - HYDRAULIC VALVES INTRODUCTION (CONT'D) | (40YC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H16) - WORKING SECTION PART NUMBER 208688M1, (USED ON UNITS WITH | (40YC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |
| (H24) - MID SECTION PART NUMBER 207115M1, (USED ON UNITS WITH SERIAL | (40YC) - DROTT SERIES-A CRAWLER EXCAVATOR (1/71-12/79) |